Physics
Craig Gidney
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139 Answers

Votes Activity Newest
133
In a roller coaster, does the rear car have a higher acceleration/speed?
Oct 9 '17 at 17:32
12
Delayed Choice Quantum Eraser: Am I missing something here?
Oct 27 '15 at 17:17
10
Quantum circuit for a $3$-qubit $|W \rangle$ state
Feb 13 '17 at 15:48
9
quantum clone of orthogonal quantum states
May 3 '16 at 20:44
8
How do we imagine a Hadamard gate acting on the Bloch Sphere?
Jan 10 '16 at 2:56
7
How is quantum teleportation any better than regular transfer of information?
Jul 13 '17 at 14:27
7
Visual interpretation, on the Bloch sphere, when Hadamard gate is applied twice
Jun 12 '17 at 1:25
7
What is quantum about the no-cloning theorem?
Dec 5 '16 at 6:18
7
Double slit experiment; evidence of wavefunction collapse
Jun 19 '16 at 3:07
7
Complexity of quantum simulation
Apr 28 '16 at 16:00
6
Is the partial trace of a mixed state always mixed? If not, are there natural examples where the partial trace of a mixed state is a pure state?
Dec 7 '17 at 18:26
6
Shor's algorithm - why doesn't the final collapse of the auxiliary qubits cripple the computation?
Nov 19 '17 at 4:10
6
Will quantum computing provide any advantage for storing large amounts of data?
Sep 22 '17 at 22:24
6
Quantum Grover's algorithm: constructing the black box gate
Apr 22 '16 at 16:13
6
Why do quantum gates have to be reversible?
Jul 28 '16 at 8:04
6
How can a quantum logic gate produce a value other than $0$ or $1$?
Jul 19 '16 at 17:45
6
Are the 'clock' and 'shift' operators used in Qudit codes physically realizable?
Jun 10 '16 at 21:29
6
How does quantum superposition make calculation faster?
May 5 '16 at 17:40
6
What is the use of a Universal-NOT gate?
Apr 3 '16 at 18:12
5
Parity Measurement Using a Single c-Z gate
Apr 14 '17 at 14:45
5
Why does the distributive law fail in quantum logic?
Feb 25 '17 at 7:12
5
Can every density operator be written as an outer product of two vectors?
May 26 '16 at 16:02
5
How can all information be localized if local realism is dead?
Mar 7 '16 at 19:46
4
Simulating Toffoli Gates with Fredkin Gates with no garbage bits
Aug 2 '17 at 17:18
4
Delayed Choice Quantum Eraser without retrocausality?
Jul 10 '17 at 17:23
4
Why is $\theta \over 2$ used for a Bloch sphere instead of $\theta$?
Dec 16 '16 at 23:45
4
Invariance of a maximally entangled state under unitary operation $U \otimes U^\dagger$
Jul 28 '16 at 15:35
4
Why is a two-qubit state described by a point in a 15-dimensional space?
Apr 13 '16 at 18:04
4
Is QC with Superpositioned Quantum Gates any different than normal Quantum Computation?
Apr 9 '16 at 7:35
3
How can work be generated from quantum correlations?
Jun 10 '19 at 0:45
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