Question

Proving $\frac{1}{2^n}\sum_{z\in\{0,1\}^n} (-1)^{z\cdot (x\oplus y)}=\delta_{xy}$, where $x\oplus y$ is the bitwise sum

score 39 · Answer 1 · 2026-03-26 06:32:37

39

Views

Proving $\frac{1}{2^n}\sum_{z\in\{0,1\}^n} (-1)^{z\cdot (x\oplus y)}=\delta_{xy}$, where $x\oplus y$ is the bitwise sum

Published on 26 Mar 2026 - 6:32

score 106 · Answer 2 · 2026-04-15 01:06:49

106

Views

When getting the outer product representation w.r.t an input and output basis, what matrix is $\langle w_{j}|A|v_{i}\rangle$ actually in?

Published on 15 Apr 2026 - 1:06

score 78 · Answer 3 · 2026-03-26 04:52:31

78

Views

Confused regarding norm and why is $\langle a|b\rangle\langle b|a\rangle = ||\langle a|b\rangle||^2$

Published on 26 Mar 2026 - 4:52

score 1.2k · Answer 4 · 2026-04-09 20:40:50

1.2k

Views

Extension of unitary operator in subsystem to complete system

Published on 09 Apr 2026 - 20:40

score 104 · Answer 5 · 2026-04-12 01:50:54

104

Views

What is the proof behind this identity used in proving the No-Cloning Theorem

Published on 12 Apr 2026 - 1:50

score 236 · Answer 6 · 2026-04-15 00:20:56

236

Views

How to prove the following entropy inequality?

Published on 15 Apr 2026 - 0:20

score 668 · Answer 7 · 2026-04-08 17:32:31

668

Views

Exercises with Dirac notation

Published on 08 Apr 2026 - 17:32

score 2k · Answer 8 · 2026-04-17 14:58:28

2k

Views

Trace of operators in Dirac's bra-ket notation

Published on 17 Apr 2026 - 14:58

score 168 · Answer 9 · 2026-04-14 09:00:59

168

Views

Calculations in Dirac's bra-ket notation

Published on 14 Apr 2026 - 9:00

score 711 · Answer 10 · 2026-04-09 14:40:48

711

Views

Trace norms of orthogonal quantum operators

Published on 09 Apr 2026 - 14:40

score 355 · Answer 11 · 2026-05-10 14:55:25

355

Views

What may be the use of Quantum Logic

Published on 10 May 2026 - 14:55

score 1.7k · Answer 12 · 2026-04-13 08:07:58

1.7k

Views

Trace inequality for the square root of the sum of matrices

Published on 13 Apr 2026 - 8:07

score 36 · Answer 13 · 2026-04-12 08:19:43

On the Hilbert space $\mathbb{R}^2$, what is a concrete example of a positive operator-valued measure that is not a projection-valued measure?

score 249 · Answer 14 · 2026-04-14 06:57:43

249

Views

Schur's lemma and average over pure states

Published on 14 Apr 2026 - 6:57

score 2k · Answer 15 · 2026-04-14 18:51:48

2k

Views

Pauli Operator acting on Hadamard Basis doesn't behave as I would expect

Published on 14 Apr 2026 - 18:51

List Question

Proving $\frac{1}{2^n}\sum_{z\in\{0,1\}^n} (-1)^{z\cdot (x\oplus y)}=\delta_{xy}$, where $x\oplus y$ is the bitwise sum

When getting the outer product representation w.r.t an input and output basis, what matrix is $\langle w_{j}|A|v_{i}\rangle$ actually in?

Confused regarding norm and why is $\langle a|b\rangle\langle b|a\rangle = ||\langle a|b\rangle||^2$

Extension of unitary operator in subsystem to complete system

What is the proof behind this identity used in proving the No-Cloning Theorem

How to prove the following entropy inequality?

Exercises with Dirac notation

Trace of operators in Dirac's bra-ket notation

Calculations in Dirac's bra-ket notation

Trace norms of orthogonal quantum operators

What may be the use of Quantum Logic

Trace inequality for the square root of the sum of matrices

On the Hilbert space $\mathbb{R}^2$, what is a concrete example of a positive operator-valued measure that is not a projection-valued measure?

Schur's lemma and average over pure states

Pauli Operator acting on Hadamard Basis doesn't behave as I would expect

Trending Questions

Popular # Hahtags

Popular Questions