# Questions tagged [quantum-teleportation]

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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 ...
1 vote
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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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### 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 ...
1 vote
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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 ...
1 vote
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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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### 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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### 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 ...