Posts Tagged ‘Technology’

Quantum teleportation revisit: Now with wormholes!

December 12, 2017 1 comment

Six years ago, I wrote a couple of posts on this blog musing about the physics behind quantum teleportation — first proposing a model in which quantum entanglement could resolve the philosophical condundrum of whether continuity of self could be maintained, then getting into some of the practical limitations that made quantum teleportation of macroscopic objects or people unlikely to be feasible. I recently came upon an article that offers a potential new angle, basically combining the idea of quantum teleportation with the idea of a wormhole.

The article, “Newfound Wormhole Allows Information to Escape Black Holes” by Natalie Wolchover, was published in Quanta Magazine on October 23, 2017. It’s talking about a theoretical model devised by Ping Gao, Daniel Jafferis, and Aron C. Wall, a way that a stable wormhole could exist without needing some kind of exotic matter with arbitrary and probably physically unattainable properties in order to keep it open. Normally, a wormhole’s interior “walls” would attract each other gravitationally, causing it to instantly pinch off into two black holes, unless you could line them with some kind of magic substance that generated negative energy or antigravity, like shoring up a tunnel in the dirt. That’s fine for theory and science fiction, but in practical terms it’s probably impossible.

The new model is based on a theory that’s been around in physics for a few years now, known in short as “ER = EPR” — namely, that wormholes, aka Einstein-Rosen bridges, are effectively equivalent to quantum entanglement between widely separated particles, or Einstein-Podolsky-Rosen pairs. (Podolsky, by the way, is Boris Podolsky, who lived and taught here in Cincinnati from 1935 until his death, and was the graduate advisor to my Uncle Harry. I was really impressed when I learned my uncle was only two degrees of separation from Einstein.) The EPR paradox, which Einstein nicknamed “spooky action at a distance,” is the way that two entangled particles can affect each other’s states instantaneously over any distance — although in a way that can’t be measured until a light signal is exchanged between them, so it can’t be used to send information faster than light. Anyway, it’s been theorized that there might be some sort of microscopic wormhole or the equivalent between the entangled particles, explaining their connection. Conversely, the two mouths of a wormhole of any size could be treated as entangled particles in a sense. What the authors of this new paper found was that if the mouths of a wormhole were created in a way that caused them to be quantum-entangled — for instance, if one of them were a black hole that was created out of Hawking radiation emitted from another black hole (it’s complicated), so that one was a direct outgrowth of the other on a quantum level — then the entanglement of the two black holes/mouths would create, in the words of the paper’s abstract, “a quantum matter stress tensor with negative average null energy, whose gravitational backreaction renders the Einstein-Rosen bridge traversable.” In other words, you don’t need exotic matter to shore up the wormhole interior, you just need a quantum feedback loop between the two ends.

Now, the reason for all this theoretical work isn’t actually about inventing teleportation or interstellar travel. It’s more driven by a strictly theoretical concern, the effort to explain the black hole information paradox. Conservation of energy says that the total amount of energy in a closed system can’t be increased or decreased. Information is energy, and the universe is a closed system, so the total amount of information in the universe should be constant. But if information that falls into a black hole is lost forever, then conservation is violated. So for decades, physicists (notably Stephen Hawking) have been exploring the question of whether it’s possible to get information back out of a black hole, and if so, how. This paper was an attempt to resolve that question. A traversable wormhole spinning off from a black hole provides a way for information to leave the interior of the black hole, resolving the paradox.

I only skimmed the actual paper, whose physics and math are way beyond me, but it says that this kind of entangled wormhole would only be open for a very brief time before collapsing. Still, in theory, it could be traversable at least once, which is better than previous models where the collapse was instantaneous. And if that much progress has been made, maybe there’s a way to refine the theory to keep the wormhole open longer.

There’s a catch, though. Physical law still precludes information from traveling faster than light. As with quantum teleportation, there is an instantaneous exchange of information between the two ends, but that information remains in a latent, unmeasurable state until a lightspeed signal can travel from the transmitting end to the receiving end. So a wormhole like this, if one could be created and extended over interstellar distances, would not allow instantaneous travel. A ship flying into one end of the wormhole would essentially cease to exist until the lightspeed signal could reach the other end, whereupon it would emerge at long last.

However — and this is the part that I thought of myself as an interesting possibility for fiction — this does mean that the ship would be effectively traveling at the speed of light. That in itself is a really big deal. In a physically realistic SF universe, it would take an infinite amount of energy and time to accelerate to the speed of light, and once you got fairly close to the speed of light, the hazards from oncoming space dust and blueshifted radiation would get more and more deadly. So as a rule, starships would have to stay at sublight speeds. In my original fiction I’ve posited starships hitting 80 or 90 percent of c, but even that is overly optimistic. So in a universe where starships would otherwise be limited to, say, 30 to 50 percent of lightspeed, imagine how remarkable it would be to have a wormhole transit system that would let a starship travel at exactly the speed of light. Moreover, the trip would be instantaneous from the traveler’s perspective, since they’d basically be suspended in nonexistence until the lightspeed signal arrived to “unlock” the wormhole exit. It’s not FTL, but it’s L, and that alone would be a damned useful stardrive. You could get from Earth to Alpha Centauri in just 4.3 years, and the trip would take no time at all from your perspective, except for travel time between planet and wormhole mouth. You’d be nearly 9 years younger than your peers when you got home — assuming the wormhole could be kept open or a second temporary wormhole could be generated the other way — but that’s better than being 2 or 3 decades younger. Short of FTL, it’s the most convenient, no-fuss means of interstellar travel I can think of.

Or, looked at another way, it’s a method for interstellar quantum teleportation that avoids all the scanning/transmission obstacles and impracticalities I talked about in my second 2011 post on the subject. No need to use a technological device to scan a body with a level of detail that would destroy it, then transmit a prohibitively huge amount of data that might take millennia to send in full. You just pop someone into one end of a wormhole and make sure the handshake signal is transmitted strongly enough to reach the other end. I’ve long felt that wormhole-based teleportation would be a more sensible approach than the disintegration-based kind anyway. Although we’re technically talking about black holes, so it wouldn’t be the sort of thing where you could just stand on a platform in your shirtsleeves and end up somewhere else. Also, there might be a little problem with getting torn apart by tidal stresses at either end. I’m not sure the paper addresses that.

This idea could be very useful for a hard-SF universe. My problem is that the universes I have established are a little less hard than that, though, since I tend to like working in universes with FTL travel of one sort or another. But maybe some idea will come to me for a future story. And maybe some other writer will read this and get an idea. We’re all in this together, and any worthwhile SF concept can inspire multiple very different stories.


Michigan trip followup

November 5, 2017 3 comments

Well, I’ve been back from my visit to the Detroit area for a couple of days. I had a pretty uneventful drive both ways, taking about 6 hours each way, what with stops for rest breaks, lunch, and fuel. (I had half a tank when I started, and I realize in retrospect that if I’d waited to fill up until it was low, I could probably have made the round trip with just one refill. But I didn’t.) The only problem is that my GPS shut down on me a couple of times, including while I was in the middle of Detroit rush hour traffic. That’s the second trip I’ve had where that happened — I wonder what the problem is. My smartphone is a few years old now, so maybe planned obsolescence is starting to kick in. Anyway, I don’t really need GPS for most of the trip, since it’s just straight up and down I-75. It was just the last leg getting to Huntington Woods, and getting from there back to 75 South, that I still need a reminder for.

So I had a nice little visit with family, and the book signing at the Huntington Woods Public Library was on Wednesday evening. It was a much smaller group than I’d hoped for. Apparently the World Series was in its seventh game that night or something, although I wouldn’t think there’d be that much overlap between my audience and sports fans. But whatever the reason, there were only about a half-dozen or so people there. So we all sat around one round table and had a nice little chat about writing and Star Trek and stuff for 90 minutes. I gave away most of my giveaway copies of Patterns of Interference, but I only sold one book. I was hoping for more financially, but otherwise I can’t complain. I guess I shouldn’t have expected a huge group (although the library reserved a really big meeting hall for me).

The one other thing of note I did on my trip was to visit the Cranbrook Institute of Science, a natural history museum that’s part of the larger Cranbrook Educational Complex, itself a historic landmark. Alas, I couldn’t afford the extra fee for the chocolate exhibit they’re currently showing, but the rest of the museum was interesting, particularly the geological specimens. I quite liked this iridescent fossil shell in the lobby, which came out really nicely in my photo, with a fiery glow seemingly from within:

Cranbrook fossil shell

And here’s an item from the geology exhibit that’s close to my heart:

Beryl, var. Emerald(I think I once briefly considered using Beryl as Emerald Blair’s middle name. I figured it was too on the nose.)

They had a section on meteorites too, including a really nice Don Davis painting of the Tunguska event, which can also be seen here. There was also a replica T. rex skeleton that you can get really close to — I’m not sure I’ve ever really gotten a sense of just how big they were. That would’ve been scary. There was also a Michigan-centric section about Ice Ages and glaciers carving the landscape, and an anthropology section with items from various world cultures all displayed together. That section had a video presentation using that so-called “hologram” technology that projects what looks like a freestanding, translucent flat image in open space. I ducked down to the side to take a closer look at how it works, and it’s quite simple — there’s a horizontal video screen in the ceiling and a glass plate at a 45-degree angle reflecting it (basically a beam splitter), so that the reflection looks like it’s floating upright in the air behind the glass. They set it up so that the “holographic” characters (of course this has nothing to do with actual holography) appeared to be occupying the 3D physical display behind the glass, with the hostess standing on the carpet and a little towheaded kid right out of ’60s sitcom central casting sitting on a chest and listening to her lecture about human diversity. Since they were both in the same plane, the perspective of the illusion held up well as I moved from side to side, as long as I didn’t move far enough to see how flat their images really were. The bench in front of the display was not so wide as to spoil the illusion for kids sitting on the ends. But this is me we’re talking about — when I see an illusion, I want to see how it’s made. I was always more interested in knowing the magician’s point of view than the spectator’s.

As I mentioned, the drive home on Friday was pretty uneventful, but one weird thing happened: I got 4-5 spam calls on my smartphone within just a few hours, an astonishing number. Most of them I just rejected because I was driving at the time, but there was one that went to voicemail that was an incredibly inept scam, an obviously synthesized voice speaking in hilariously ungrammatical English about how I had to pay my overdue IRS bill or something or I would get arrested “by the cops.” I wonder why there were so many calls on that day alone.

So now I’m back home, caught up on my missed TV shows, and trying to get back to work. I’m doing copyedits for a project I should be able to announce soon, and expecting copyedits for another project I hope I can announce before much longer. Plus I just got a phone call reminding me that Election Day is on Tuesday, so I should remember to research the candidates and issues before then. (I’ve been getting a ton of election fliers in the mail, but I prefer to get my info from independent sources.)

And of course, I’ll be at Erlanger’s LibraryCon this Saturday, November 11, from 11-4. This should be a bigger event, so hopefully there will be more folks around to buy my books.

Laptop followup: No joy

I just got back from a trip to Best Buy (through whom I ordered my refurbished laptop) to see if they could help me get my headphone/speaker jack working. I would’ve done it days ago, but I’ve been a bit under the weather. According to the tech guy there, the fact that the laptop doesn’t shut down its own speakers when a device is plugged into the jack means it’s not even reading the jack, which is a hardware problem rather than a software problem. Which is very bizarre, because it’s a huge coincidence that a hardware malfunction would happen at the same time I swapped out the hard drive for a new one. Unless I jarred something loose during all the flipping over of the laptop to get to the underside, or something.

Anyway, they said they’d have to send it out for a week or more to get it repaired, and I can’t afford to be without it that long. There is another place about a half-hour’s drive north of me that might have the parts in stock, but the guy suggested (I think, if I understood him right) that I could also get an RCA-to-USB adapter and plug my speakers into the USB port, which seems simpler. Unfortunately the guy said they didn’t sell them there, which seems odd. I looked around when I got home to see if, by lucky chance, I already had one, but I don’t appear to. So I guess I need to get hold of one. That probably shouldn’t be too hard.

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Laptop II: So far, so good…

After I hit a snag with the expired activation key on my replacement hard drive the last time, the refurbishers sent me another key, so I once again wielded my screwdriver to uninstall the old hard drive and put in the new one… only to find that the key I’d been sent used a letter that was disabled during installation, don’t ask me why. So I swapped back to the old drive yet again and informed them of the problem. I got a third key promptly, this one with no disabled letters, but after two failed starts (and an inadequate night’s sleep), I just didn’t feel up to trying again right away. But today, I finally went ahead and reinstalled the new one yet again.

This time, the activation key worked fine… and I found I didn’t need the MS Office activation code, because apparently Office was pre-installed on this drive and I just had to re-enter my e-mail and password. So that saved me some trouble. Then it was a matter of installing all the other basics — antivirus, e-mail client, browsers, Acrobat, and a couple of my other most-used programs, along with Windows security updates. I’m now basically functional again, and it took only about 3 1/2 hours. I still have a few nonessentials to install, but they can wait.

I have noticed a couple of odd things, though. Like, when I installed new programs and tried to put their icons on the taskbar or desktop, they didn’t show up right away, though they did after I rebooted. And there have been a couple of times when I’ve minimized and re-expanded Firefox and the buttons in the top right corner have either vanished or been replaced with fatter buttons. I really hope these aren’t warning signs of something wrong with the new drive or its software. This is my third hard drive from this refurbisher in the year and seven months (almost to the day) since I bought this laptop. I really want this one to work!!

EDIT: Annnd…  there’s already a problem. The headphone/speaker jack won’t work anymore. Hoo boy.

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Laptop: Good news and bad news

Well, since I had a lull between other projects, I decided that today was the day I would finally go ahead and replace the iffy hard drive I’ve been using with the second replacement drive the refurbisher sent me after the first replacement crashed.

First off, though, I decided to try reinstalling the crashed drive, just on the off chance that I could get it working long enough to back up the files I hadn’t backed up at the time of its crash. I wasn’t really expecting this to work, so imagine my surprise when it started up perfectly normally! I wasn’t willing to trust in that, though, so I hastened to back things up onto my thumb drive. The recovered files aren’t anything really urgent, just a handful of pictures and personal documents, but it’s a relief to have them back.

So then I put in the new drive and tried to start it up — and I hit a pretty big snag. The drive came “imaged” with the same Windows 7 copy as the previous drives, so it had the same activation key — but what I didn’t realize was that I apparently had to use that key within 30 days of getting it, and it’s been something like twice that now. I guess I’ll have to contact the refurbisher and ask if they can reset it or something.

In the meantime, I’m making do with the original drive, which has been working mostly fine for the past couple of months, though I don’t know how much I can rely on that. Wish me luck.


February 1, 2016 2 comments

Hey, all. I’m still here. I’ve been kind of preoccupied with a few things this month, mainly finishing up Star Trek: The Original Series: The Face of the Unknown, which I’ve just sent off to my editor. I think it’s turned out very well, especially considering that I had all those computer problems delaying me over the past few months. Fortunately the writing went smoothly for the most part; I actually finished the first draft early, but then I realized there were some additional story threads I needed to add, and it’s taken me until last night to get those sorted out.

As for my computer, it’s been working quite smoothly so far. I’ve got just about everything up and running as it should, and I haven’t had any trouble since I finished reinstalling stuff on the replacement hard drive. I’m thinking I should look into getting a backup drive that I can clone or image my drive to on a regular basis, so that it would be easier to restore if something else goes wrong. But I’ve never really figured out how to do backups beyond just copying my documents onto removable media. (Which used to mean whole boxes full of floppy disks, and now means a tiny plastic stick in my pocket. We live in the future!)

I’ve also been working my way through a rewatch of classic Doctor Who, as I mentioned before. I’m getting near the end of the William Hartnell era now, which means I’m going to be watching a lot of reconstructions of missing episodes for a while. Though I am getting the DVD of the restored “The Tenth Planet” through interlibrary loan. I’ve only just figured out how to extend my search to other Ohio libraries and request materials from them, which has let me track down some things I could never find otherwise. That also includes some of the non-Godzilla kaiju films I’ve been looking for, so you can expect the return of my Toho review series in the near future. (Sorry it didn’t occur to me to do Doctor Who reviews. I don’t think I’d have the time anyway.)

Now that I’m done with my Trek novel, I’m hoping to spend the next month or so working on original short fiction, hopefully including at least one new Hub story. Although I’ve already been delayed getting to that by my computer problems, so I hope nothing else comes up to divert me.

In the more immediate term, I should probably go for a walk today. We’re getting a spell of unseasonably warm weather hereabouts, after a bitter cold snap last week. Although in this age of climate change, we’ll probably have to throw out our past ideas of what’s unseasonable.

Speaking of which, I should probably take my car in for some maintenance soon. Over the past month, it’s had trouble getting started in cold weather — that is, the engine starts, but the car initially resists moving when I step on the gas. The first time it happened, I thought something must be obstructing the wheels, but nothing was. The resistance to acceleration gradually subsides, though it takes a couple of blocks to get back to normal. I figure some kind of lubricant must be depleted or in need of changing, though it seems to work okay in warmer weather or after a short enough interval of non-use. (I generally only drive once or twice a week.)

Up and running again (mostly)

January 2, 2016 1 comment

As it turned out, when I contacted the suppliers of my refurbished PC to arrange for it to be shipped in for repairs, they offered to send me a replacement pre-imaged hard drive that would have a copy of the same Windows 7 operating system on it, so that I could swap it out myself. That would certainly take less time than sending the laptop back in and waiting to get it back, so I went for that. After all, I’d seen the guy at Best Buy take the hard drive out to inspect it, so I knew how to do it. Two weeks passed and no drive came, so I complained, and it arrived two days after that. I was uneasy that it had been sent in just a padded envelope instead of something sturdier, but I installed it today and it seems to be working fine. And since I just did all this a bit over a month ago, I was able to do it more efficiently this time, though it still took forever for some of the software to download from the Internet, so it took all afternoon and then some. (Though this time I backed up and copied my documents with a thumb drive rather than using the network connection between PCs, and it was far, far faster, as I’d hoped.)

Some stuff will have to wait until tomorrow, but I’ve now got the essential stuff reinstalled and working — except for my e-mail client program, eM Client. For some reason, when I installed a new copy and tried overwriting its mailbox data files with the up-to-date ones from the old drive (which I’d copied onto my old laptop as a backup and transferred back from there), it led to some kind of malfunction in the program and it crashed. I still have the data on my old computer; I just need to figure out how to get it working on my new-new computer. I don’t know what I’m doing wrong this time that’s different from when I transferred the data files the other way. I really hope I can get it figured out tomorrow. I need to get past these computer troubles once and for all so I can get back to work on my writing.

UPDATED: Okay, I figured out what I was doing wrong with the mail client. I had to delete the entire application data folder before copying the entire old one into its place. When I tried to overwrite the existing folder, it somehow created duplicate files in some weird way (even though I clicked on the replace option in the file manager), and when I tried to just copy the .dat files, I guess it created a conflict the program couldn’t resolve. Once I wiped the whole database folder and replaced it with the old one, the program worked fine.

So now I’ve got all the essential stuff reinstalled and some of the less urgent stuff. There are still a few things left to do, like reinstalling my printer drivers from the CD, but I’m basically back on track after less than 24 hours.

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