Questions tagged [quantum-teleportation]

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Is an infinite precise momentum measurement machine actually a teleporting device?

We know that, due to the uncertainty principle, the momentum and position of one object can be measured completely accurately at the same time. However, there is no theoretical limit if we only ...
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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 ...
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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 ...
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How can information be communicated with entanglement? [closed]

Forgive my overly simplistic view of this. But I have been wondering this for years. Any insight would be greatly appreciated. So imagine you have two entangled particles, and they are separated and ...
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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 ...
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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>_{...
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Can momentum be transmitted by using quantum teleportation?

I have read that you can use quantum teleportation to transmit states from one place to another. If you have two entangled systems A and B you can measure the A system in such a way that measuring the ...
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Why is quantum teleportation needed to transmit a state?

Suppose that Alice wants to teleport the state $|\psi \rangle = \alpha |0 \rangle + \beta |1 \rangle$ to Bob. My issue is why quantum teleportation is needed to transmit this state. Why is it not ...
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On teleportation

I read about the teleportation in a simple explanation involving Alice and Bob. I understood the part where Alice and Bob are given one of the particle from an entangled pair. And then Alice measures ...
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How does the quantum teleportation protocol not violate the no-cloning theorem?

Consider the following protocol: Alice and Bob share the state \begin{equation} |\Phi^+\rangle=\frac{1}{\sqrt{2}}(|0\rangle|0\rangle \pm |1\rangle|1\rangle) \end{equation} Alice has to teleport to ...
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Is fidelity of teleportation a particular case of quantum correlations?

Fidelity is measure of distance between density operators. it is a measure of the "closeness" of two quantum states, the input state $\rho_{in}$ and the teleported state $\rho_{out}$. where ...
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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 ...
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Viewing quantum teleportation as a channel

Suppose Alice has two qubits $A'$ and $A$ and Bob has one qubit $B$. The system is in the state $$\rho_{A'}\otimes \Phi^+_{AB} $$ where $\rho$ is an arbitrary state and $\Phi^+$ is the maximally ...
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ER=EPR, Entanglement and Subjectivity

ER=EPR refers to a conjectured connection between entanglement and Einstein-Rosen bridges. Consider the quantum teleportation circuit, where Alice ($A$) and Bob ($B$) make use of an entangled pair of ...
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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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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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343 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 ...
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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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575 views

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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Can quantum tunneling cause a particle to travel instantaneously across a distance essentially teleporting it? [closed]

Can quantum tunneling essentially teleport subatomic particles?
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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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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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721 views

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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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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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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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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191 views

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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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 ...