'Yep. And it is the act of making the measurement that causes the wave function to collapse into either the dead or alive state,' Larry finished for me.
'So what does this have to do with teleportation and this quantum connection?'
'I'm not done yet,' he said. 'Now assume that you look at a pion decay. When a pion, this subatomic particle, decays it becomes an electron and a positron, and they must be in antiparallel spin states so as not to violate conservation of spin angular momentum. In other words, if the electron has a spin Up then the positron must have a spin Down and vice versa. Now, if we have not measured which particle is in which state then there is an equal probability that the electron will be in either state and the same for the positron. Therefore, you have an electron traveling along with a wave function for Up and Down spins and a positron doing the same. If we measure the electron to see which state it is in, and we find that it is in the spin Up state, then instantly, even if the positron is on the other side of the universe, the positron wave function will collapse to the spin Down state. The reason why is because the two particles came from the same quantum event and their wave functions got tangled up with each other. It is this wave function entanglement that is called the
'Okay, my brain hurts.' I rolled my neck to the right then left and scratched my head. 'I think I understand this, but you said Einstein had something to do with this?'
'Oh, I forgot to mention, this thought experiment is called the Einstein-Podolsky-Rosen Experiment, or most commonly the EPR experiment, because they came up with it. Einstein didn't like this instantaneous 'spooky' action and suggested this is a problem with quantum mechanics. Well, like it or not, EPR is real. It has been verified many times over. But to Einstein's credit, the reason he didn't like it was because the instantaneous events could enable signals to be sent back in time. Let's not get into that, but it turns out that statistics won't allow that to happen. You can go read about that yourself in a quantum book somewhere.'
'Well, if you can't send data with it, what use is it?' I was getting more and more confused. 'How deep does the rabbit hole go, Alice?' I asked.
'Curiouser and curiouser,' Larry smiled. 'Back in the early part of the first decade of this millennium, several experiments were conducted that enabled data transmission via EPR. An optical setup was rigged so that the photons from a laser beam were quantum connected in a special cube of a material called KD-star-P, and then split into two separate paths. The reference beam was then encoded by polarizing the photons to a spin Up or vertical Up polarization. The other beam shifted instantaneously to a spin Down or vertical Down polarization.
'Following that effort several different labs even used EPR to teleport at the speed of light an information- encoded bunch of photons from ten or so meters across a lab. A couple experiments around 2013 even showed that atoms could be teleported across a great distance at the speed of light. Here is how it worked.' Larry scrolled through the slides until he found the right one again. 'Uh . . . let's see. This is the one . . . a beam of photons are entangled or 'connected' inside a laser and then split and sent down separate paths.' He pointed out the red laser beams with the little handheld pointer connected to the mouse. The mouse pointer on the screen would move wherever he pointed the hand wand. My guess was that it was like a light gun for a video game; a thought which distracted me for just a moment.
He continued, 'Now each of these photons in the beams are quantum connected to each of the photons in the other path. The left beam here is interfered with another optical beam that is encoded with data. Now the data contains much more information than say a single RAM chip might hold, say a terabit of data, and it would require a lot of energy and time to transfer a terabit of data. But the interference beam it makes when imposed on the quantum connected beam is just a few kilobits. We pump that low bandwidth interfered beam over to the other connected beam here on the right. When the two beams are interfered together in the right way,
'You mean that really works? Sounds too good to be true, man, we could make a computer without low- bandwidth wire or optical connections that could operate at like a terahertz or much faster than that!' This stuff was exciting.
'Now you understand, Steve ol' boy. The problem is that we haven't figured out how to make good use of it just yet. In order for this to be useful, you have to be able to do calculations and instructions on the data right there in the memory location. It would slow the machine way down if you had to pump the bits to be operated on from the memory to the processor and back and forth through wires. Since the CPUs can only use a few kilobits per register it would be like filling up a five-gallon bucket with a cup. It would just take too long.' I laughed that he just used the same analogy that I had used for my final exam and told him as much.
'Let me get this straight,' I said. 'The bottleneck here is actually being able to manipulate a lot of data in parallel. One CPU can't work on a terabyte of data all at once. Is that the problem?' I was beginning to understand why this was too good to be true.
Larry was smiling again. 'You catch on quick, Stevie. Yep, that's the problem in a nutshell. If all we had to do was move data around this would be awesome fast. But we might want to add or multiply or something to that data sometimes. We need to be able to work on all the data at once in parallel.'
We continued to bat around these ideas for a couple hours, occasionally taking bathroom and soda or coffee breaks. We finally finished up around five-thirty or so and decided to give it a rest. We packed up the classified room and put the disk back in the safe. Larry showed me how to get in and out of the safe. Then I grabbed my stuff from my desk. I had paperwork for my new pay grade and new insurance and benefits packages. I also took home a handful of technical journal papers that Larry gave me on EPR. One paper particularly caught my eye. It was entitled 'Experimental Detection of Entanglement with Polarized Photons' and had been written by a bunch of Italian people. I planned to read it later that evening after walking Lazarus.
That day was a lot to absorb. I wasn't quite sure why the effort was Top Secret but it was. When I had asked about that, Larry just shrugged and told me that I didn't have a need to know that yet. But he did tell me that my job was to make the technology useful. Cool job, I thought. I could be instrumental in the development of the fastest, most powerful computer ever built. Wow!
Then my stomach growled and I remembered that the fridge at home was empty. So, I stopped and grabbed some burgers for Laz and me on the way home. Laz, as always, was happy to see me. I set the burgers on the counter and patted him on the head. Then I debated on a beer or a pill. I went with the beer. The next thing I knew it was seven-forty-six and Laz was licking me on the face and my beer was still in my hand.
'Damn, I must've dozed off. I guess I should take those pills a little more regularly, huh buddy.' I scratched his white belly and he whined at me and kicked his hind legs like dogs do.
I got up and heated us up a couple hamburgers. We ate dinner and then went for a walk, happier than I had felt in a long while.
