User Quantum Guy 123

16 votes

1 answer

7k views

What is a stabilizer state?

asked Jul 1, 2021 at 15:31

9 votes

2 answers

668 views

Prove the fidelity can be written in terms of Pauli expectation values as ${\rm tr}(\rho\sigma)=\sum_k \chi_\rho(k)\chi_\sigma(\rho)$

asked Jul 2, 2021 at 22:04

8 votes

1 answer

937 views

How to calculate the average fidelity of an amplitude damping channel

asked Feb 16, 2021 at 17:28

8 votes

1 answer

304 views

Does conjugation by a Clifford send each non-identity Pauli to every other non-identity Pauli with equal frequency?

asked Nov 19, 2021 at 17:39

7 votes

1 answer

2k views

What is a proof for the principle of deferred measurement?

asked Jul 1, 2021 at 18:07

6 votes

2 answers

830 views

Proof for Cardinality of the Clifford Group

asked Sep 27, 2021 at 23:28

6 votes

3 answers

1k views

Is the SWAP gate a Clifford Gate? How would I express it using the Clifford Gate generators?

asked Nov 11, 2021 at 17:40

5 votes

3 answers

998 views

How are eavesdroppers detected when using BB84 in the presence of noise?

asked Jul 3, 2021 at 20:07

5 votes

2 answers

434 views

Is the column vector of a uniformly sampled random unitary matrix a uniformly sampled random state vector?

asked Jan 18, 2021 at 23:00

5 votes

0 answers

85 views

What is the best quantum process tomography method?

asked Apr 26, 2021 at 17:22

4 votes

1 answer

267 views

How to Aggregate Multiple Gate Fidelities

asked Dec 22, 2020 at 22:40

4 votes

1 answer

314 views

Can quantum error correction work on any type of channel?

asked Mar 22, 2021 at 18:49

4 votes

1 answer

121 views

In what contexts are different notations used for indicating measurement outcomes?

asked Jun 10, 2022 at 19:13

4 votes

2 answers

587 views

What is the largest number of stabilizers a pure state can have?

asked Nov 28, 2021 at 23:25

3 votes

3 answers

187 views

Do sequences of operations (including measurements) applied to different halves of an entangled pair always commute?

asked Jun 28, 2021 at 20:37

3 votes

1 answer

739 views

Simulate a quantum channel with a certain fidelity

asked Jan 5, 2021 at 23:17

3 votes

2 answers

391 views

Can weak measurements or quantum state tomography break bb84?

asked Mar 2, 2021 at 21:07

2 votes

1 answer

226 views

Why can any density operator be written this way? (quantum tomography)

asked Mar 8, 2021 at 21:00

2 votes

1 answer

2k views

If you apply a unitary transformation to an entangled state, is it still entangled?

asked Mar 9, 2021 at 21:29

2 votes

4 answers

375 views

Can a qubit be entangled with an arbitrary quantum state, without altering it?

asked Apr 27, 2021 at 20:46

2 votes

0 answers

118 views

What is the best method for estimating average channel fidelity?

asked Apr 26, 2021 at 15:54

2 votes

3 answers

189 views

What is a term for a basis state along with its corresponding complex amplitude?

asked Aug 6, 2021 at 15:26

2 votes

3 answers

2k views

Is every single-qubit unitary just a rotation around some unit vector on the Bloch sphere?

asked Jul 6, 2021 at 22:28

2 votes

0 answers

29 views

What is a realistic model for simulating physical tampering of a channel? (ex: nearby vibrations)

asked Apr 18, 2022 at 22:38

2 votes

1 answer

192 views

What is the average amount of gates needed to implement a random Clifford gate?

asked May 3, 2022 at 21:40

2 votes

1 answer

126 views

Is there a name for a gate that 'moves' one qubit to a new position via multiple SWAP gates?

asked Jun 4, 2022 at 18:51

1 vote

1 answer

164 views

What is a bipartite unitary?

asked Jul 7, 2021 at 20:21

1 vote

2 answers

515 views

Does applying a random Pauli matrix to a density matrix result in the identity?

asked Oct 5, 2022 at 21:23

1 vote

2 answers

128 views

Can you perform quantum process tomography using an orthonormal basis the contains non Hermitian matrices?

asked Mar 12, 2021 at 16:14

0 votes

1 answer

126 views

Can Gate Set Tomography work on Quantum Channels?

asked Mar 31, 2021 at 22:00

Stack Exchange Network

31 Questions

What is a stabilizer state?

Prove the fidelity can be written in terms of Pauli expectation values as ${\rm tr}(\rho\sigma)=\sum_k \chi_\rho(k)\chi_\sigma(\rho)$

How to calculate the average fidelity of an amplitude damping channel

Does conjugation by a Clifford send each non-identity Pauli to every other non-identity Pauli with equal frequency?

What is a proof for the principle of deferred measurement?

Proof for Cardinality of the Clifford Group

Is the SWAP gate a Clifford Gate? How would I express it using the Clifford Gate generators?

How are eavesdroppers detected when using BB84 in the presence of noise?

Is the column vector of a uniformly sampled random unitary matrix a uniformly sampled random state vector?

What is the best quantum process tomography method?

How to Aggregate Multiple Gate Fidelities

Can quantum error correction work on any type of channel?

In what contexts are different notations used for indicating measurement outcomes?

What is the largest number of stabilizers a pure state can have?

Do sequences of operations (including measurements) applied to different halves of an entangled pair always commute?

Simulate a quantum channel with a certain fidelity

Can weak measurements or quantum state tomography break bb84?

Why can any density operator be written this way? (quantum tomography)

If you apply a unitary transformation to an entangled state, is it still entangled?

Can a qubit be entangled with an arbitrary quantum state, without altering it?

What is the best method for estimating average channel fidelity?

What is a term for a basis state along with its corresponding complex amplitude?

Is every single-qubit unitary just a rotation around some unit vector on the Bloch sphere?

What is a realistic model for simulating physical tampering of a channel? (ex: nearby vibrations)

What is the average amount of gates needed to implement a random Clifford gate?

Is there a name for a gate that 'moves' one qubit to a new position via multiple SWAP gates?

What is a bipartite unitary?

Does applying a random Pauli matrix to a density matrix result in the identity?

Can you perform quantum process tomography using an orthonormal basis the contains non Hermitian matrices?

Can Gate Set Tomography work on Quantum Channels?