User user27286

9 votes

2 answers

3k views

What does it mean to "measure an operator"?

asked Dec 9, 2020 at 1:20

8 votes

1 answer

342 views

What are tentpole topics in quantum computing?

asked Feb 8, 2021 at 8:33

7 votes

1 answer

2k views

How do we find the stabilizer generators for the three-qubit bit-flip code spanned by $|000\rangle$ and $|111\rangle$?

asked Feb 3, 2021 at 15:12

7 votes

3 answers

1k views

Partial Cyclic Permutation with only Toffoli and CNOT gates?

asked Feb 20, 2021 at 17:58

4 votes

1 answer

790 views

Application of QFT to Order-finding

asked Jan 12, 2021 at 12:51

4 votes

1 answer

206 views

What is the difference between $|0\rangle+|1\rangle$ and a balanced mixture of $|0\rangle$ and $|1\rangle$? [duplicate]

asked Feb 7, 2021 at 23:02

3 votes

2 answers

848 views

What's the idea behind the unitary freedom of ensemble decompositions for density matrices?

asked Dec 7, 2020 at 13:41

3 votes

4 answers

116 views

In Bell's inequalities, what is the meaning of assuming that the physical properties $P_Q,P_R,P_S,P_T$ have definite values?

asked Feb 10, 2021 at 10:23

3 votes

2 answers

336 views

Output of Quantum Phase Estimation Algorithm

asked Jan 15, 2021 at 1:48

3 votes

1 answer

158 views

Is the order of the tensor product in $|\phi\rangle\otimes|\chi\rangle=|\chi\rangle\otimes|\phi\rangle$ relevant? [duplicate]

asked Feb 24, 2021 at 22:38

3 votes

3 answers

464 views

Intuition behind the use of inverse FFT in Quantum Circuit for Hamming weight

asked Feb 27, 2021 at 1:17

3 votes

1 answer

2k views

What is the procedure of finding z-y decomposition of unitary matrices?

asked Feb 28, 2021 at 0:36

2 votes

1 answer

133 views

Why does $\sum_n \langle n|M_m\rho M_m^\dagger|n\rangle$ simplify to $\langle \psi|M_m^\dagger M_m|\psi\rangle$?

asked Feb 25, 2021 at 1:58

2 votes

1 answer

150 views

Does $\mathrm{tr}(A \otimes B) = \mathrm{tr} (A) \otimes \mathrm{tr}(B)$ hold for partial trace?

asked Feb 20, 2021 at 19:25

2 votes

1 answer

193 views

Stabilizer code: error detection why does it matter?

asked Feb 3, 2021 at 15:16

2 votes

1 answer

128 views

Why isn't $\{1,2,3\}$ well ordered? [closed]

asked Feb 6, 2021 at 8:30

2 votes

1 answer

111 views

Discrepancy in inner product between tensor products

asked Nov 28, 2020 at 21:20

2 votes

1 answer

284 views

EPR pair and individual operations [closed]

asked Feb 10, 2021 at 12:31

2 votes

1 answer

126 views

5 qubit codewords definition in terms of operators: Mermin

asked Feb 14, 2021 at 11:37

2 votes

1 answer

63 views

What is the meaning of approximating a phase to an accuracy of $2^{-n}$?

asked Feb 18, 2021 at 16:38

1 vote

2 answers

1k views

Is there a simplified formula for the adjoint of the outer product of ket and bra?

asked Feb 16, 2021 at 0:51

1 vote

2 answers

684 views

What are the properties of the matrices representing quantum gates?

asked Nov 10, 2020 at 7:56

1 vote

1 answer

215 views

What is the conjugate transpose of $|0\rangle_{A}|1\rangle_{B}$?

asked Feb 26, 2021 at 20:17

1 vote

1 answer

148 views

Does sending a qubit using a quantum network through some conventional physical medium mean it is not with sender anymore after sending?

asked Feb 22, 2021 at 16:45

0 votes

1 answer

41 views

Dimensionality and value of $\mathbb{I}_A$ in Quantum operations

asked Feb 28, 2021 at 12:55

0 votes

1 answer

365 views

How many real numbers are required to describe density matrix for $n$ qubits?

asked Feb 21, 2021 at 11:22

0 votes

1 answer

251 views

Compute the squared overlap between different given qubit states

asked Dec 23, 2020 at 8:23

0 votes

2 answers

922 views

Explanation of NOT gate in Hadamard basis [closed]

asked Dec 23, 2020 at 18:22

0 votes

1 answer

264 views

What additional conditions are there to make POVM measurement same as projective measurement?

asked Feb 16, 2021 at 1:03

0 votes

0 answers

30 views

How do we find out the measurement operators $M_{m}$ which gives us the desired measurement results?

asked Feb 16, 2021 at 1:12

Stack Exchange Network

31 Questions

What does it mean to "measure an operator"?

What are tentpole topics in quantum computing?

How do we find the stabilizer generators for the three-qubit bit-flip code spanned by $|000\rangle$ and $|111\rangle$?

Partial Cyclic Permutation with only Toffoli and CNOT gates?

Application of QFT to Order-finding

What is the difference between $|0\rangle+|1\rangle$ and a balanced mixture of $|0\rangle$ and $|1\rangle$? [duplicate]

What's the idea behind the unitary freedom of ensemble decompositions for density matrices?

In Bell's inequalities, what is the meaning of assuming that the physical properties $P_Q,P_R,P_S,P_T$ have definite values?

Output of Quantum Phase Estimation Algorithm

Is the order of the tensor product in $|\phi\rangle\otimes|\chi\rangle=|\chi\rangle\otimes|\phi\rangle$ relevant? [duplicate]

Intuition behind the use of inverse FFT in Quantum Circuit for Hamming weight

What is the procedure of finding z-y decomposition of unitary matrices?

Why does $\sum_n \langle n|M_m\rho M_m^\dagger|n\rangle$ simplify to $\langle \psi|M_m^\dagger M_m|\psi\rangle$?

Does $\mathrm{tr}(A \otimes B) = \mathrm{tr} (A) \otimes \mathrm{tr}(B)$ hold for partial trace?

Stabilizer code: error detection why does it matter?

Why isn't $\{1,2,3\}$ well ordered? [closed]

Discrepancy in inner product between tensor products

EPR pair and individual operations [closed]

5 qubit codewords definition in terms of operators: Mermin

What is the meaning of approximating a phase to an accuracy of $2^{-n}$?

Is there a simplified formula for the adjoint of the outer product of ket and bra?

What are the properties of the matrices representing quantum gates?

What is the conjugate transpose of $|0\rangle_{A}|1\rangle_{B}$?

Does sending a qubit using a quantum network through some conventional physical medium mean it is not with sender anymore after sending?

Dimensionality and value of $\mathbb{I}_A$ in Quantum operations

How many real numbers are required to describe density matrix for $n$ qubits?

Compute the squared overlap between different given qubit states

Explanation of NOT gate in Hadamard basis [closed]

What additional conditions are there to make POVM measurement same as projective measurement?

How do we find out the measurement operators $M_{m}$ which gives us the desired measurement results?