Questions tagged [quantum-teleportation]

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Can Quantum Energy Teleportation theoretically be used for interstellar travel?

I see that, recently, Quantum Energy Teleportation has become real physics: https://www.quantamagazine.org/physicists-use-quantum-mechanics-to-pull-energy-out-of-nothing-20230222/ Could this be ...
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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 ...
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Two-mode squeezing and EPR

Consider the two-mode squeezing operator $S(\xi)=\exp\left(\xi\hat{a}^{\dagger}\hat{b}^{\dagger}-\xi^*\hat{a}\hat{b} \right)$ with $\xi=r\exp(\text{i}\phi)$, and assume that the initial state of the ...
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When is Quantum State Teleportation useful?

I've been working through the Brilliant Course on Quantum Computing, and I've reached the lesson on Quantum Teleportation. After completing the lesson and reading several questions and answers here: ...
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Is there an efficient way to execute a quantum channel using its Choi state?

Consider you are given a Choi state $$ \sigma = (\mathcal{E} \otimes I) | \omega \rangle \langle \omega| \qquad {\rm with } \quad |\omega \rangle = \frac{1}{\sqrt{d}}\sum_{i} |ii \rangle \quad \textrm{...
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What is counterportation for the layman?

The word counterportation has been appearing in my sphere of the internet somewhat frequently and I don’t think I understand what it is. See here: https://phys.org/news/2023-03-counterportation-...
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Overview of quantum energy teleportation

I'm looking for a research-level review of the concept of quantum energy teleportation. I did find http://www.tuhep.phys.tohoku.ac.jp/~hotta/extended-version-qet-review.pdf, but it is more than 10 ...
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Can an electron randomly teleport to Mars? [duplicate]

Layman here, so this is another infuriatingly wrong pop-science ispired question. :) The way I understand it an electron (and many/all other elementary particles?) is not a little ball orbiting an ...
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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 ...
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Entanglement persistence in quantum teleportation

I have a question regarding quantum teleportation. The scenario is the usual one where Alice as a qubit to transmit, A, and shares an entangled pair of qubits {B1,B2} with Bob. My question is: once ...
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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 ...
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With the tunnel effect, because matter travels through solid matter, why wouldn't teleportation be possible? [duplicate]

The tunnel effect is when quantum particles sometimes go through a solid object. If this is possible, then teleportation between, say portal locations throughout the earth, should be possible. Why or ...
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Will quantum events ever occur on a macro-scale rather than a vacuum? Michio kaku says there's a chance we'll wake up on Mars tomorrow

https://www.theatlantic.com/science/archive/2018/10/beyond-weird-decoherence-quantum-weirdness-schrodingers-cat/573448/ In this post, it is shown that quantum decoherence in the macro world occurs ...
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How much classical information is transmitted in continuous variable teleportation?

In order to do quantum teleportation of $n$ qubits, you need to send $2n$ bits of classical information, in order to ensure that you get the original state and not a relative phase change of the ...
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If there's a small probability particles may teleport anywhere in an infinite Universe, shouldn't stars pop up in existence close to us ever so often?

I've been having a question on the top of my mind for a while, and didn't really manage to get it solved, so I'm asking it here: Assuming that particles may "teleport" (or superposition, or ...
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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 ...
Mathphys meister's user avatar
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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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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 ...
Swapnil B's user avatar
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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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How is quantum teleportation possible when there's a continuum of possible states to send over?

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 ...
XXDD's user avatar
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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 ...
Nicolás Quesada's user avatar
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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?
Maxwell Baker's user avatar