Quantum Computing
Norbert Schuch
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16
Can quantum states have negative probability?
Jul 29 '20
10
What does it mean "less than identity" in the operator sum representation?
Jan 18 '20
9
Quantum Supremacy: How do we know that a better classical algorithm doesn't exist?
Nov 18 '18
8
Maximally mixed states for more than 1 qubit
Nov 1 '18
7
How is a promise gap related to a spectral gap?
Mar 20
7
Do the Kraus operators of a CPTP channel need to be orthogonal?
Aug 8 '19
7
How to find the operator sum representation of the depolarizing channel?
Dec 16 '18
7
How to construct a multi-qubit controlled-Z from elementary gates?
Aug 24 '18
6
CS conjecture that Quantum Computer cannot solve NP-complete problems, but Boson Samplers do a #P-hard problem. How is it?
Jan 22
6
Can any channel be written as $\Phi(X)=\operatorname{Tr}_{\mathcal Z}[U(X\otimes \sigma)U^\dagger]$ for any state $\sigma$?
Jul 18 '20
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I spent a great deal of time answering a question, then the question (unfortunately along with the answer) was deleted. What can be done?
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41
What's the intuition behind the Choi-Jamiolkowski isomorphism?
38
State of Matrix Product States
31
Canonical examples of quantum channels
27
Canonical examples of quantum channels
15
Trouble with operator-sum representation of a quantum operation

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