User user27286

9 votes

2 answers

3k views

What does it mean to "measure an operator"?

asked Dec 9, 2020 at 1:20

9 votes

1 answer

345 views

What are tentpole topics in quantum computing?

asked Feb 8, 2021 at 8:33

8 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

889 views

Application of QFT to Order-finding

asked Jan 12, 2021 at 12:51

4 votes

1 answer

211 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

925 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

120 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

356 views

Output of Quantum Phase Estimation Algorithm

asked Jan 15, 2021 at 1:48

3 votes

1 answer

161 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

524 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

136 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

165 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

205 views

Stabilizer code: error detection why does it matter?

asked Feb 3, 2021 at 15:16

2 votes

1 answer

148 views

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

asked Feb 6, 2021 at 8:30

2 votes

1 answer

116 views

Discrepancy in inner product between tensor products

asked Nov 28, 2020 at 21:20

2 votes

1 answer

298 views

EPR pair and individual operations [closed]

asked Feb 10, 2021 at 12:31

2 votes

1 answer

145 views

5 qubit codewords definition in terms of operators: Mermin

asked Feb 14, 2021 at 11:37

2 votes

1 answer

65 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

703 views

What are the properties of the matrices representing quantum gates?

asked Nov 10, 2020 at 7:56

1 vote

1 answer

267 views

Compute the squared overlap between different given qubit states

asked Dec 23, 2020 at 8:23

1 vote

1 answer

228 views

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

asked Feb 26, 2021 at 20:17

1 vote

1 answer

150 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

404 views

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

asked Feb 21, 2021 at 11:22

0 votes

2 answers

974 views

Explanation of NOT gate in Hadamard basis [closed]

asked Dec 23, 2020 at 18:22

0 votes

1 answer

271 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?

Compute the squared overlap between different given qubit states

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?

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?