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Prove that $Apreceq B$ implies $A=Psi(B)$ for some channel $Psi$

1 answer

Quantum Computing Asked 2 years ago

How do I measure a single qubit in a two-qubit state?

1 answer

Quantum Computing Asked 2 years ago

How to find the reduced density matrix of a four-qubit system?

2 answer

Quantum Computing Asked 2 years ago

Show that $I = frac{rho + sigma_xrhosigma_x +sigma_yrhosigma_y + sigma_zrhosigma_z}{2}$ for all states $rho$

7 answer

Quantum Computing Asked 2 years ago by evethompson123

How is it possible to guess what state the qubit was in by measuring it?

3 answer

Quantum Computing Asked 2 years ago

Calculate probability of a state after depolarization

2 answer

Quantum Computing Asked 2 years ago

How do I prove that the Hadamard satisfies $Hequiv e^{ipi H/2}$?

4 answer

Quantum Computing Asked 2 years ago

Prove that $Apreceq B$ implies $A=Psi(B)$ for some channel $Psi$

1 answer

Quantum Computing Asked 2 years ago

What is the Kraus representation of quantum-to-classical channels?

1 answer

Quantum Computing Asked 2 years ago

Can a Kraus representation act as the identity on any operator?

4 answer

Quantum Computing Asked 2 years ago

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