Quantum Computing
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John Watrous
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43 Answers

Votes Activity Newest
15
Rigorous security proof for Wiesner's quantum money
Apr 4 '18 at 13:30
13
How does the vectorization map relate to the Choi and Kraus representations of a channel?
Mar 31 '19 at 14:34
13
Imperfect Quantum Copying
Oct 26 '18 at 11:11
12
Who discovered the phase kickback trick?
Feb 7 '19 at 3:06
11
What is a complementary map?
Mar 28 '19 at 18:06
11
What role does the non-commutativity of the tensor product play in experimental quantum computation?
Nov 5 '18 at 21:54
11
Proof of an Holevo information inequality
May 25 '18 at 19:00
10
Is the set of all states with negative conditional Von Neumann entropy convex?
Dec 20 '18 at 13:05
10
What does it mean for a density matrix to “act on a Hilbert space $\mathcal{H}”$?
Jun 21 '18 at 12:37
9
Positive semidefinite relationship after partial trace
Dec 15 '20 at 18:55
8
Closeness of purifications of states
Nov 29 '20 at 20:49
8
Is there a lower bound on the average diamond norm of two uniformly random unitaries U1 and U1 of dimension D that are sampled from haar measure?
Feb 25 '20 at 20:27
8
What is the relationship between the Toffoli gate and the Popescu-Rohrlich box?
Jun 18 '18 at 13:00
7
Why is the size of the top register for Shor's algorithm chosen as it is?
Jan 21 '20 at 19:25
7
Is there a polynomial quantum algorithm for graph coloring?
Feb 10 '19 at 19:35
7
Classical complexity for Simon's problem
Dec 26 '18 at 16:48
7
In a Quantum Turing Machine, how is the decision to move along the memory tape made?
Apr 4 '18 at 14:43
6
What separable $\rho$ only admit separable pure decompositions with more than $\mathrm{rank}(\rho)$ terms?
Jul 24 '20 at 13:48
6
Generalising the standard quantum teleportation protocol: what are the possible unitaries?
Mar 3 '20 at 1:48
6
Optimizing over quantum channels
Jan 16 '20 at 15:00
6
Degradable channels and their quantum capacity
May 9 '19 at 15:43
6
Balanced vs unbalanced superposition distinguisher
Nov 6 '18 at 14:55
6
Image of a sum of positive operators contains the images of each individual operator?
Sep 5 '18 at 20:34
6
Query regarding BQP belonging to PP
Jul 23 '18 at 12:51
6
What quantum channels are considered in quantum communication, and how does this choice affect the construction of error correction codes?
May 31 '18 at 16:33
5
Prove that the trace norm is dual to the spectral norm
Oct 28 '20 at 13:54
5
Can the fidelity $F(\rho,\sigma)$ be computed knowing only $\rho - \sigma$?
Jul 4 '20 at 13:09
5
Are entanglement witnesses of this form optimal?
May 12 '19 at 13:04
5
Relating min-entropy with conditional entropy
Oct 15 '18 at 20:01
5
How to permute (reshuffle) an n-bit input?
Jun 4 '18 at 14:54
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