Thanks ETL.
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Posted on 08/08/2018 2:58:41 PM PDT by ETL
“In the future, we will attempt to teleport the mechanical vibrations,”
somebody freep-mail me when they can teleport a pizza and a beer ...
But flipping that switch would break the entanglement. The Uncertainty Principle is not easily confounded!
Did you really just say that our knowledge of a granite countertop must be counter-intuitive? ;-)
I once asked Roger Penrose, mentor of Stephen Hawkings, at a public lecture at Columbia 12-15 years ago, if, since the entire universe was once contained within a singularity (Big Bang singularity), a quantum entity of sorts, might it, the entire universe, be in some form of instantaneous, long distance communication today. He loved the question, but didn't know how to answer it.
Physicists Tied Laser Beams into Knots
space.com | August 6, 2018 10:37am ET | Rafi Letzter, Live Science Staff Writer
Posted on 08/06/2018 11:02:50 AM PDT by BenLurkin
http://www.freerepublic.com/focus/chat/3676993/posts
Thanks ETL.
A multinational team of researchers led by University of Cambridge scientist Dr. Alessandro Rossi and University of Adelaide’s Dr. Giuseppe Tettamanzi has developed a ground-breaking single-electron ‘pump.’ Their work was published on June 19, 2018 in the journal Nano Letters.
“In quantum metrology, semiconductor single-electron pumps are used to generate accurate electric currents with the goal of implementing the emerging quantum standard of the ampere,” said Dr. Rossi, Dr. Tettamanzi and their colleagues from Aalto University and the Universities of New South Wales and Latvia.
“Pumps based on electrostatically defined tunable quantum dots have thus far shown the most promising performance in combining fast and accurate charge transfer.”
“However, at frequencies exceeding approximately 1 GHz the accuracy typically decreases.”
The single-electron pump developed by the team can produce one billion electrons per second and uses quantum mechanics to control them one-by-one.
It’s so precise the scientists have been able to use their device to measure the limitations of current electronics equipment.
“Achieving full control of electrons in these nano-systems will be highly beneficial for realistic implementation of a scalable quantum computer,” Dr. Tettamanzi said.
“We, of course, have been controlling electrons for the past 150 years, ever since electricity was discovered. But, at this small scale, the old physics rules can be thrown out.”
In the Nano Letters paper, the scientists also report observations of electron behavior that’s never been seen before — a key finding for those around the world working on quantum computing.
“Quantum computing, or more broadly quantum information processing, will allow us to solve problems that just won’t be possible under classical computing systems,” Dr. Tettamanzi said.
“It operates at a scale that’s close to an atom and, at this scale, normal physics goes out the window and quantum mechanics comes into play.”
“To indicate its potential computational power, conventional computing works on instructions and data written in a series of 1s and 0s — think about it as a series of on and off switches; in quantum computing every possible value between 0 and 1 is available.”
“We can then increase exponentially the number of calculations that can be done simultaneously.”
“This research puts us one step closer to the holy grail — reliable, high-performance quantum computing,” he said.
http://www.sci-news.com/physics/single-electron-pump-06195.html
Twice you’ve posted articles about quantum computing. They’re informative, but they seem to be in response to my assertion that “Quantum entanglement is ... not useful for ... quantum computing.” They don’t seem to say anything about entanglement. Am I missing something?
Sorry, guess I misunderstood what you said. Will get back to it later.
John Preskill, the Richard P. Feynman Professor of Theoretical Physics, is himself deeply entangled in the quantum world. Different rules apply there, and objects that obey them are now being made in our world, as he explains at 8:00 p.m. on Wednesday, April 3, 2013, in Caltech’s Beckman Auditorium. Admission is free.
Q: What do you do?
A: I’m trying to understand what a quantum computer would be capable of, how we could build one, and whether it would really work. My background is in particle theory, a subject I still love, but in the spring of 1994 a mathematician at Bell Labs named Peter Shor [BS 1981] discovered an algorithm for factoring large numbers with a quantum computer.
I got really excited by this, because it moved the boundary separating “easy” problems, which we can eventually expect to solve with advanced technologies, from truly hard problems that we may never be able to solve. There are problems we can solve using quantum physics that we couldn’t solve otherwise. The crucial problem is protecting a quantum computer from the various kinds of “noise” that could destroy quantum entanglement, and we’ve made a lot of progress on that.
Q: OK, so what’s “entanglement?”
A: It’s the correlations between the parts of a system. Suppose you have a 100-page book with print on every page. If you read 10 pages, you’ll know 10 percent of the contents. And if you read another 10 pages, you’ll learn another 10 percent. But in a highly entangled quantum book, if you read the pages one at a time—or even 10 at a time—you’ll learn almost nothing. The information isn’t written on the pages. It’s stored in the correlations among the pages, so you have to somehow read all of them at once.
There’s another important difference: If Alice and Bob both read this morning’s New York Times, they will have perfectly correlated information. And if Charlie comes along and reads the same paper later on, he will be just as strongly correlated with Alice as Alice is with Bob, and Bob will be just as correlated with Charlie as he is with Alice. But if Alice reads her quantum newspaper and Bob reads his, they will learn almost nothing until they get together and share their information. Now, when Charlie comes along, Alice and Bob have already used up all their ability to be entangled, and he’s completely left out. Entanglement is monogamous—if Alice and Bob are as entangled as they can be, neither of them can entangle with Charlie at all. So if Alice wants to be entangled with both Bob and Charlie, there’s a limit to how entangled she can be with either one. They have to work out some sort of compromise.
Q: What gets you excited about this?
A: The technology is emerging to make it possible to do things we’ve never done before. We were taught in school that classical physics applies to things you can see, and quantum physics applies to the world at the scale of atoms and below. We’re rebelling against that by making systems that are big enough to see, yet still exhibit quantum behavior. For example, Professor of Applied Physics Oskar Painter [MS 1995, PhD 2001] has made a tiny silicon bar that’s suspended in space, and he’s successfully cooled it all the way down to its quantum-mechanical ground state. It vibrates in a mode that corresponds to its lowest quantum state. He hasn’t entangled such bars yet, but he knows how to do it.
We’re exploring a new frontier of physics. It’s not the frontier of short distances, like in particle physics; or of long distances, like in cosmology. It’s what you might call the entanglement frontier.
http://www.caltech.edu/news/quantum-entanglement-and-quantum-computing-39090
Well it seems solid, but is mostly empty space.
Ah, I get it now. Very good!
Remember to marble at the wonders of the universe; don’t take them for granite.
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