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9 votes
1 answer
470 views

Quantum attack on hash functions

7 votes
1 answer
381 views

Why does Google's quantum processor outperform IBM's?

7 votes
1 answer
165 views

Bob applies a projector - what happens to eigenvalues of Alice's reduced state?

7 votes
1 answer
188 views

Closest quantum state with a fixed marginal: Analytical solution?

6 votes
3 answers
1k views

What is the location of the Qiskit config file?

6 votes
2 answers
302 views

Balanced vs unbalanced superposition distinguisher

6 votes
2 answers
2k views

How to find the operator sum representation of the depolarizing channel?

5 votes
3 answers
599 views

Intuitive role of the polar decomposition in proof of Uhlmann's theorem for fidelity

5 votes
1 answer
722 views

Getting a layout for qubits in Qiskit

5 votes
0 answers
108 views

Connection between smooth max-relative entropy and smooth max-information

5 votes
1 answer
73 views

What is the quantum analogue of $P_{XY} = P_{Y|X}P_X$

5 votes
2 answers
48 views

What is the form of a unitary $U$ that preserves the marginals on a given state, $\text{Tr}_A(U\rho_{AB} U^\dagger) = \rho_B$?

5 votes
1 answer
203 views

Trace distance between mixed state and pure state vs trace distance between their purifications

5 votes
1 answer
180 views

Closeness of purifications of states

5 votes
1 answer
142 views

Does $\mathcal E^{\otimes n}$ admit a more efficient Stinespring dilation than the one used for $\mathcal E$?

5 votes
1 answer
61 views

Upper bounding a permutation invariant state

4 votes
0 answers
118 views

Calculating the entropy of a quantum state

4 votes
1 answer
70 views

Non-lockability of quantum max-entropy

4 votes
1 answer
93 views

Is there a higher dimensional Fredkin gate?

4 votes
1 answer
61 views

Quantum channel between two states with inaccessible reference - when can it be done?

4 votes
1 answer
142 views

Can vectorization lead to mixed states?

4 votes
0 answers
98 views

Forbidden/allowed outputs of a quantum channel

4 votes
1 answer
101 views

Questions about the relation between max-relative entropy $D_{\max}(\rho||\sigma)$ and max-information

4 votes
0 answers
142 views

Schumacher compression - comparing with Shannon compression

4 votes
1 answer
139 views

How to maximise over linear functionals of quantum channels?

3 votes
1 answer
366 views

What does a "Choi state" where we relax the partial trace condition represent?

3 votes
0 answers
102 views

Convexity of coherent information - erroneous argument!

3 votes
0 answers
69 views

Proof that quantum entanglement does not increase the asymptotic capacity of classical channel

3 votes
1 answer
99 views

Going from a circuit to the quantum state output of the circuit

3 votes
1 answer
344 views

What exactly is the relation between the Holevo quantity and the mutual information?