All Questions
32 questions
13
votes
1
answer
872
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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 ...
- 722
11
votes
4
answers
21k
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 ...
user29660
11
votes
2
answers
1k
views
Can't quantum teleportation be superluminal some percentage of times?
I apologize if this is a really silly question.
In the (textbook) quantum teleportation algorithm, in the step right after Alice has measured her system but before she has sent her classical ...
- 544
8
votes
2
answers
365
views
University of Delft results regarding quantum teleportation of information
I have a college-level understanding of Physics. A recent study from the University of Delft in the Netherlands that seems to suggest that quantum teleportation of information (as in "communication of ...
- 397
6
votes
1
answer
5k
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 ...
- 1,421
4
votes
2
answers
3k
views
Is High-Fidelity Quantum-Entanglement Data-Transfer Real?
I was discussing quantum entanglement with a friend and explaining that faster than the speed of light data transfer isn't a reality with our current understanding of physics. He brought up quantum ...
- 307
4
votes
1
answer
4k
views
Quantum teleportation and no-communication theorem
According to the Wikipedia article for the No-communication theorem:
In very rough terms, the theorem describes a situation that is analogous to two people, each with a radio receiver, listening to ...
- 55
2
votes
2
answers
2k
views
What is the difference between Quantum teleportation and Radio waves?
Quantum teleportation over 143 kilometres using active feed- forward
What is the difference between Quantum teleportation and radio waves?
anon
2
votes
3
answers
243
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 ...
- 105
2
votes
1
answer
130
views
Does the type of entangled pair make any difference in quantum teleportation?
From what I understand, in order to teleport the state of a qubit from place A to place B I need an entangled pair whose entanglement state will be consumed to perform the teleportation. All the ...
- 169
2
votes
1
answer
201
views
Quantum teleportation of atomic states that involve energy [duplicate]
With quantum computing the concern is with information, and when quantum teleportation appears, the states being transferred are often spin states.
However, there is an energy difference, even if ...
- 7,295
2
votes
0
answers
43
views
Is it possible to conduct quantum teleportation with a larger than necessary e-dit and preserve entanglement?
Suppose you have an e-bit between qubits A and B. You want to transfer the state of qubit Q to B. You can utilize this e-bit to perform a quantum teleportation to achieve this.
Now instead suppose ...
- 1,805
2
votes
0
answers
113
views
In quantum teleportation when exactly the original EPR pair stops being entangled?
In quantum teleportation Alice and Bob share a pair of entangled particles (EPR pair made of particles 2 and 3, for example). Alice has another particle (1) whose quantum state she wants to send to ...
2
votes
0
answers
97
views
Teleportation and boosted observer, special relativity
According to relativistic quantum information, entanglement, purity of states are not Lorentz invariant.
Here I check such a problem. If we have two coordinate systems $R_A,R_B$ with relative ...
- 1,576
2
votes
1
answer
2k
views
How do scientists entangle photons? [closed]
How do scientists entangle photons? One documentary I watched said that scientists can transport a single photon by entangling 2 other photons and somehow they are able to "teleport" them. How is it ...
- 175
1
vote
3
answers
196
views
What's wrong with my teleporter? [closed]
Reading on the no communication theorem and quantum teleportation, I have difficulty understanding the following thought experiment.
A light source is emitting photons at a regular intervals $T$ in a ...
- 4,472
1
vote
1
answer
392
views
How do 3 physically entangled particles work?
Say a particle split into 3 particles that are all entangled to each other, if all 3 particles were to be measured simultaneously or rather if I'm to measure only one of them can I thus predict the ...
- 13.1k
1
vote
1
answer
420
views
How does quantum teleportation work without faster than light communication? [duplicate]
So recently I watched a MinutePhysics explanation of quantum teleportation. Recently I have also been asking questions about quantum entanglement, and the answer I am most often getting is faster than ...
- 319
1
vote
0
answers
73
views
Continuous-variable teleportation circuit using finite squeezing
I am studying the continuous variable teleporting circuit using a vacuum squeezed state showed by Weedbrook, pag. 39-40. Section: Gaussian errors from finite squeezing; in that, they propose an ...
1
vote
0
answers
86
views
What are the benefits of quantum teleportation of continuous variables over discrete variables? [closed]
I have been learning about quantum teleportation in general and I was wondering what was the motivation behind achieving quantum teleportation of continuous
variables.
Edit: I'm aware that it is ...
- 23
0
votes
2
answers
119
views
Why are Alice's states in teleportation superpositions, not "pure" tensor states?
I'm trying to understand the Wikipedia article on quantum teleportation. Since the two particles of Alice are not entangled, all base states $|i\rangle\otimes|j\rangle$ for $i,j\in\{0, 1\}$ of the ...
- 1,507
0
votes
1
answer
74
views
Can you project on an orthogonal basis for a multipartite quantum system using only local operations and classical communication?
Say Alice possesses one qubit, and Bob two, and that the joint state is $|\psi_{A, B_1, B_2}\rangle = \alpha|n_1\rangle + \beta |n_2\rangle$, where $|n_1\rangle$ and $|n_2\rangle$ are orthonormal ...
- 145
0
votes
1
answer
471
views
Is quantum teleportation really teleportation? [closed]
I don't understand how quantum teleportation is considered teleportation if no information is transfered (in q-bits). Wouldn't it be less misleading calling it "quantum encrypting" or something ...
- 211
0
votes
1
answer
570
views
Is teleportation possible?
When I just learned about quantum entanglement, I read that if two electrons are in quantum entanglement and placed in two different places, the photon which interacted with one electron is teleported ...
0
votes
1
answer
95
views
Continuous variable Fourier gate and teleportation circuit
I am studying the teleporting circuit of continuous variable showed by Weedbrook, pag. 37. Fig. (164); in that, they propose an input state to the circuit as
$$ \left|\psi\right>\left|0\right>_{...
0
votes
0
answers
301
views
How are joint measurements of quantum states realized experimentally?
I have a question regarding the experimental implementation of joint measurements of quantum states.
While I understand for example the teleportation protocol using Bell states, something that still ...
- 425
-1
votes
1
answer
94
views
Is quantum teleportation guessable?
The only obstacle preventing quantum teleportation to break the speed of light (in terms of communication speed) is the need to use classical communication to tell the other party how to perform the ...
- 2,167
-1
votes
1
answer
185
views
Does quantum teleportation lead to a change of quantum states?
Particles A and B are entangled, quantum information of particle A is transmitted to particle B via quantum teleportation, does particle B's quantum state change? What happens to particle A's quantum ...
- 472
-1
votes
1
answer
54
views
Would it be possible to manufacture Quantumly entangled atoms for lets say a phone or some other type of communication? [closed]
So lets say you have this wonderful machine that can entangle two atoms.Then you take atom A and you know how to make it spin clockwise and back counterclockwise and connect it to an 8 bit cable.Then ...
- 11
-2
votes
2
answers
142
views
Can a non-entangled qubit be teleported by entangling it?
Let's say I have a qubit that is not entangled in state $\psi$. I want to teleport this qubit by entangling it with another qubit but still getting $\psi$ back in the end.
Is this possible, or would ...
- 497
-2
votes
1
answer
146
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 too,...
-3
votes
2
answers
298
views
Communication via teleportation/entanglement (FTL communication)
I know this has been asked many times, but I have a hard time "crystallising" it in my mind.
First: let's say we teleport a DVD (with quantum teleportation). Isn't this FTL communication?
Second: ...
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