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Questions tagged [quantum-teleportation]

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If quantum entanglement isn't a physical thing how does it makes quantum teleportation work? [duplicate]

I read about superposition and correlation between entangled particles and there is no physical communication between them, but obviously quantum teleportation uses this correlation to send something ...
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In standard quantum teleportation, when can quantum states be distinguished with certainty?

Through a few examples, I'd like to learn under what circumstances can different quantum states be distinguished from each other. So for example, the standard quantum teleportation scheme starts out ...
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What's the Entropy change in Quantum Teleportation?

Suppose a single qubit quantum teleportation From A to B through a bell states by quantum gate performance. The setting was the usual one usual one i.e. Suppose initial the unknown states $|\psi\...
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Quantum teleportation with moving Alice and Bob

I have questions regarding quantum teleportation, which keep confusing me. Suppose Alice and Bob are in the same inertial frame K, and at time t (in K) Alice teleports a quantum state to Bob. What I ...
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Applications of Quantum Teleportation

Are there any practical or theoretical applications for quantum teleportation? I have tried looking online but its unclear if there are any others (other than quantum encryption)
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What are the possible reasons for transformations failing in SLOCC?

I apologize beforehand if this is a really noobie question. But I'm trying to understand one aspect of SLOCC. In a SLOCC scenario, we want to transform state $A$ to $B$ using only LOCC operations. ...
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CNOT-Gate acting on entangled qubit state with more than two qubits

I asked this already in reddit but got now answers, so I hope here is the right place. Question in short: Is there a general form of the CNOT Gate, so I can apply it to an arbitrary entangled state ...
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Can we use entangled black holes to form wormholes?

If any object can be made black hole by crushing it to its Schwarzschild radius, can we do the same process in two different points in the space keeping the quantum states of both the objects ...
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Markovian approximation for teleportation? [closed]

Assume a model including a system with time dependent Hamiltonian ( 3 entangled qubits subject to a noisy reservoir) coupled weakly to a thermal bath. in order to study the time evolution of a ...
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Is Quantum teleportation possible for large objects like a cat, for example? [duplicate]

Ok, here's the idea. This isn't really connected to what is usually referred to as 'quantum teleportation', but assuming that all particles can tunnel to a different location given the right ...
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Is it theoretically possible to control or modify the probability of finding an electron?

We know that according to Quantum physics , electrons are not just regular particles with discrete location, and they kind of occupy all the space which has the ‘ highest probability ‘. We can also ...
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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 ...
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Wigner function in quantum teleportation

I'm starting to manipulate Wigner function and I'm studying the Wigner function approach in Quantum Teleportation. My reference for this is page 29-30 of Braunstein and Van Loock "Quantum ...
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Quantum teleportation reversible?

The following figure displays a circuit implementing quantum teleportation. It uses Haramard transform (H), controlled not (+), measurements (meas), a Not gate (N) and a phase shift gate (P) to ...
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Can a particle used in quantum teleportation be used again for information state transfer?

I'm not an expert on this, but I've tried to read this article and this article from Nature. I've also seen this answer which claims that you can use quantum teleportation combined with a classical ...
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Intuition on quantum teleportation

I'm trying to understand quantum teleportation and I was wondering if anyone could provide an intuition about it. I have seen the derivation but it still bugs me. You start with an entangled pair of ...
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Simple proof of classical fidelity of teleportation

I understand that the optimal value, i.e 2/3, can be achieved if Alice and Bob are connected via a classical channel, and Alice makes a projective measurement. Note that this is just one of the ways ...
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In quantum teleportation, how do the measurement & reconstruction steps work mathematically?

In the quantum teleportation protocol, we have Alice trying to teleport a qbit $\begin{bmatrix} \alpha \\ \beta \end{bmatrix}$ to Bob. Alice has two qbits in her possession, one of which starts out ...
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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 ...
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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 ...
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What does the minus sign in a Bell state imply? [closed]

I know that the Bell states $|\Psi^{\pm}\rangle = \frac{1}{\sqrt{2}}(|10\rangle \pm |01\rangle)$ and $|\Phi^{\pm}\rangle = \frac{1}{\sqrt{2}}(|11\rangle \pm |00\rangle)$ represent correlated ($|\Phi^{\...
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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 ...
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2answers
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What is the 3 dB limit of standard parametric squeezing techniques?

Is there a simple picture of what is the 3 dB limit in squeezing of standard parametric squeezing techniques? This limit is mentioned in many papers e.g. the Google search for 3 dB limit in cavity ...
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How is quantum teleportation any better than regular transfer of information?

After the article that China "teleported" a particle into orbit, I'm trying to understand the applications of quantum teleportation. It sounds like a nice oddity of the universe, but has very little ...
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Teleportation and the observers effect

I'm a layman, and I was wondering, if teleportation is to ever exist, I'd assume it'd be in the sense that you would take the object you are trying to teleport, get it's exact makeup, then send that ...
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1answer
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Can Quantum Teleportation be accomplished faster than the speed of light? [duplicate]

Let us say Alice wants to communicate state |T> (also a qubit) to Bob. Given, they have an EPR Pair shared amongst them. Alice interacts her qubit with |T> and then sends the measured state (classical ...
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Are black and white holes linked? [duplicate]

Theoretically, if black holes are entrances where you are sucked in and you appear somewhere else, do we come out of a white hole? I ask this because a white hole is the opposite of a black hole that ...
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quantum teleportation

I don't know much about quantum teleportation but I read that scientists have succeeded in various quantum teleportation experiments. I'm wondering if one researcher were just inside the event horizon ...
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115 views

Are all realistic quantum-mechanical expectation values Lorentz invariant?

I was asked if it might be possible use entanglement to travel faster than light. Trying to formulate this in a more orthodox way, I ended up with this question: Is there a proof that the expectation ...
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1answer
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Time Wormholes Detection

Was reading the possibility of time travel. Now Hawkings states that they haven't invented time travel, because we haven't had a visit from a time machine yet. But he also states that there exists ...
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3answers
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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 ...
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2answers
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On what qubit does Bob perform Pauli Correction in Quantum teleportation protocol?

In the lecture notes it is said that Bob applies the Pauli correction operation $X^x \cdot Z^z$ on his qubit. My questions: 1) Am I correct that Pauli correction ...
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1answer
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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 ...
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Patent for full body teleportation system using wormholes [closed]

A friend has shown me this, and I'm quite interested 1) why this is an official patent if it wouldn't work 2) and if it would work, why isn't it already created? ABSTRACT Full body ...
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Can quantum error correcting codes compensate for post-selected quantum teleportation?

The process for quantum teleportation ends with two fixup operations, applied by Bob, conditional on the respective results of two measurements done by Alice. Sometimes, when you read about ...
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Speed of Quantum Teleportation? [duplicate]

Is Quantum Teleportation limited by distance/time/speed? In the classical world, the travel of information is limited by the speed of light. So I'm wondering: is there a time delay if we send ...
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If a photon is in a early/late superposition how can those states be either in-phase or out-phase?

I'm trying to understand this image. Full article is here. I do understand why the photon after step 1 is in superposition if early and late state. However I don't understand why those states are ...
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What does it mean to send a photon somewhere while another “remains behind”?

Today this article appeared in the news, describing an experiment lead by Dr Wolfgang Tittel at University of Calgary, involving information teleportation via photons: http://www.bbc.co.uk/news/...
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Is space travel really possible?

Just a thought, does not relate to actual physics If the universe is really expanding, then if we send probes to distant locations in the universe with earthly data, then will the probes ever reach ...
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1answer
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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 ...
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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 ...
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China quantum telecom [closed]

Perhaps did you read this information : China’s Latest Leap Forward Isn’t Just Great—It’s Quantum Beijing launches the world’s first quantum-communications satellite into orbit State media ...
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Who's states would change first and how?

If someone's quantum states were copied a few miles away and a group of particles there were changed to the same states(except position), thus a copy of that person would form a few miles away. If I'm ...
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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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Teleportation without classical channel

In an article on vixra, there is a statement that teleportation of information can be done without the use of classical communication channel. I know that this is forbidden by the no-communication ...
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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 ...
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Quantum teleportation and macroscopic objects

Purely speculative. If not allowed, I'll delete. If quantum teleportation was scalable to macroscopic objects, I assume it would require an amount of matter at the destination, equal to the amount of ...
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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 ...
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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 ...