9
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0answers
178 views

Quantum computing records (entangled qubits)

What is the current record number of entagled qubits and how has this number been increased? The latest result on stack exchange, which is 3 years old, reports 14 via this post: How many stabilised ...
2
votes
1answer
34 views

Transportation using disintegration [duplicate]

Is it physically possible to have one device, that will scan one object atom by atom and record it to some computer file and then send it to some other machine that could use this blueprint to rebuild ...
-2
votes
1answer
49 views

Does the success of quantum teleportation means quantum cloning is possible too?

Well, I thought this might just be possible. Instead of having Bob and Alice having an entangled pair, they have multiple (> 2) amount of entangled quantum object (I'm not sure if this is possible ...
2
votes
2answers
186 views

Why is Quantum Teleportation important in Cryptography?

I think the physical principle is that (Wikipedia): For every qubit teleported, Alice needs to send Bob two classical bits of information. These two classical bits do not carry complete ...
0
votes
2answers
89 views

Quantum teleportation - the alternative to destroying atoms [closed]

Can't you just disassemble, not destroy our atoms and transport them to another teleporter via networking or telecoms? This is my thinking of how to keep the same person, not an exact copy of ...
1
vote
3answers
605 views

What is coherence in quantum mechanics?

What are coherence and quantum entanglement? Does it mean that two particles are the same? I read this in a book called Physics of the Impossible by Michio Kaku. He says that two particles behave in ...
1
vote
1answer
253 views

Mathematical explanation of quantum teleportation

I am now studying quantum teleportation. I get what the process is like but I'm wondering why it happens this way. You've got two entangled particles A and B whose wavefunctions are entangled. You ...
1
vote
0answers
73 views

How large must the Quantum teleportation fidelity have to be in order for it to be useful?

This question relates and stems from my original question. Please read this one and the comments before answering this question. Quantum Teleportation Fidelity I know that for discrete variables ...
0
votes
1answer
135 views

Classical Communication in Quantum Teleportation

How we could define the classical communication in the quantum teleportation protocol? I mean, classical communication means to send a classical signal. But what happens if we are in an unclear ...
3
votes
1answer
265 views

Why are the equal probabilities for Bell state measurement outcomes essential for “quantum teleportation”?

I've recently been introduced to the basics of finite-dimensional quantum mechanics from a purely mathematical point of view (with a quantum-information theme to it). When discussing quantum ...
2
votes
2answers
454 views

What is the difference between Quantum teleportation and Radio waves?

Quantum teleportation over 143‚ÄČkilometres using active feed- forward What is the difference between Quantum teleportation and radio waves?
5
votes
2answers
244 views

Why do they call it quantum teleportation?

So I have been trying to learn about entanglement and quantum teleportation and from what I've been able to gather so far, the teleportation part seems to be misleading. At first I thought that the ...
2
votes
3answers
88 views

Can two distinct spatially separated many-body systems in the ground state contain entangled particles?

In particular, I am asking if two distinct many-body systems (e.g. system A and system B) separated at some arbitrary distance will necessarily be found to contain entangled particles (such that ...
9
votes
1answer
165 views

What is a Hilbert space filter?

In a recent paper, Side-Channel-Free Quantum Key Distribution, by Samuel L. Braunstein and Stefano Pirandola. Phys. Rev. Lett. 108, 130502 (2012). doi:10.1103/PhysRevLett.108.130502, ...
2
votes
1answer
632 views

Is traveling at the speed of light the same thing as teleportation?

If I were on one side of the room and moved at the speed of light to the other side of the room, to an observer it would appear that I teleported. If time stops at that speed, it would be ...
16
votes
2answers
680 views

Why can't quantum teleportation be used to transport information?

Kaku Michio says in an interview that we've teleported photons, cesium atoms and beryllium atoms. Having watched a lot of Kaku as well as way too many astrophysics documentaries in general, I know ...
0
votes
2answers
853 views

Can quantum communication really replace electromagnetic waves for telecommunication medium in future?

Currently I am planning to get masters degree. So I am thinking about a subject in which I have to get masters degree. Following are my questions to leading physicists.. Which technology is the ...
0
votes
1answer
202 views

Is the quantum state or information of a particle is all that differentiates it from another particle?

So I have learned in my QM classes that you can't tell one electron from another electron. They are indistinguishable. I also learned that the wavefunction of a particle includes the spacial part and ...
2
votes
1answer
1k views

What are the benefits of quantum information “teleportation”?

I read occasionally popular science articles and from time to time encounter issues about quantum information teleportation. (this one for example http://www.physorg.com/news193551675.html) So far I ...
8
votes
3answers
733 views

Could teleportation ever really happen?

Could any form of matter teleportation every really happen? If so, what form would it take? Some science-fiction talks about literally sending the atoms from one location to another; others talk of ...