User manuel459 - Physics Stack Exchange

5 votes

1 answer

964 views

Is the reduced density operator a density operator itself?

asked Jun 19, 2022 at 14:01

4 votes

2 answers

300 views

Nielsen and Chuang give 4 nomenclatures / definitions for projective measurements - are they equal?

asked Aug 18, 2022 at 13:24

3 votes

1 answer

49 views

Vanishing off diagonals means non observability of quantumness - But aren't superposition always non observable (in pointer basis)?

asked Sep 14, 2022 at 10:06

3 votes

0 answers

996 views

CNOT Gate in Pauli Basis

asked May 18, 2022 at 9:30

3 votes

0 answers

82 views

Macroscopic quantumness and decoherence

asked Sep 7, 2021 at 15:46

3 votes

1 answer

190 views

Dephasing noise as a decoherence model - Effect on a generalized GHZ state

asked Jan 25, 2023 at 23:55

3 votes

1 answer

240 views

Interpreting a Density Matrix Resulting from Decoherence of a generalized GHZ State

asked Feb 1, 2023 at 23:42

3 votes

2 answers

1k views

How to derive the reduced density matrix in a mathematically precise and correct way

asked Jun 16, 2022 at 13:02

2 votes

1 answer

111 views

Have often named "applications of quantum physics" existed before the theory itself?

asked Oct 12, 2022 at 16:39

2 votes

2 answers

310 views

Millikan experiment: calculating $e$

asked Apr 4, 2021 at 12:51

2 votes

1 answer

142 views

Einstein notation and writing down the geodesic equation - a misunderstanding?

asked Apr 30, 2021 at 15:09

2 votes

0 answers

101 views

Definition of tensor product in Nielsen & Chuang "Quantum Computation and Quantum Information"

asked Mar 20, 2022 at 22:03

2 votes

1 answer

90 views

Defining the Inner Product for Product-Hilbert Spaces

asked Mar 22, 2022 at 21:16

2 votes

2 answers

286 views

Christoffel Symbols of a parallel shift

asked Mar 18, 2021 at 16:22

2 votes

3 answers

132 views

Thought experiments - a didactic tool?

asked Mar 29, 2021 at 11:01

2 votes

1 answer

362 views

How to prove that every mixed one-qubit state admits a Bloch-sphere representation? [duplicate]

asked Mar 15, 2022 at 15:10

2 votes

1 answer

321 views

Does this derivation of the reduced density matrix really prove it containing "all measurement statistics"?

asked Jun 21, 2022 at 10:15

2 votes

0 answers

51 views

How do different $|\text{Alive}\rangle+|\text{Dead}\rangle$ kind of states behave under decoherence?

asked Sep 25, 2022 at 11:08

2 votes

1 answer

273 views

Coherence and superposition principle - equivalent properties?

asked May 4, 2022 at 9:11

2 votes

1 answer

40 views

Is there a mistake in this paper when calculating the reduced density matrix (simple model)?

asked Jun 1, 2022 at 19:58

1 vote

2 answers

380 views

Where does the definition of partial trace as ${\rm Tr}_b(O)=\sum_j(I\otimes \langle b_j|)O(I\otimes|b_j\rangle)$ come from?

asked Jun 21, 2022 at 21:09

1 vote

0 answers

51 views

Gaussian Decoherence - How to (mathematically) arrive at this statement?

asked Jun 1, 2022 at 13:58

1 vote

1 answer

191 views

Conservation of Angular Momentum during a bike or motorcycle jump

asked Mar 1, 2020 at 10:18

1 vote

1 answer

643 views

Calculating wheel loads on a motorcycle / car / bike [closed]

asked Apr 1, 2020 at 11:30

1 vote

0 answers

28 views

What do Paz and Zurek mean by "one-bit" measurement in Heiss' Fundamentals of Quantum Information?

asked Mar 29, 2022 at 10:36

1 vote

1 answer

53 views

What does Leggett mean by quantum states like $|\psi\rangle=(a|\psi_1\rangle+b|\psi_2\rangle)^N$?

asked Mar 30, 2022 at 14:22

1 vote

0 answers

189 views

Von Neumann measurement - the only reasonable way to describe a measurement?

asked Apr 11, 2022 at 15:45

1 vote

2 answers

764 views

The Schrödinger-Equation. A linear differential equation of what order?

asked Apr 20, 2022 at 22:33

1 vote

2 answers

2k views

Quantum coherence - what is it's definition?

asked May 2, 2022 at 23:29

1 vote

0 answers

134 views

Why are smartphone antennas not $\lambda/2$ of the wavelength? Why are patch-antennas used instead of simple dipole antennas? [closed]

asked Nov 20, 2021 at 21:50

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56 Questions

Is the reduced density operator a density operator itself?

Nielsen and Chuang give 4 nomenclatures / definitions for projective measurements - are they equal?

Vanishing off diagonals means non observability of quantumness - But aren't superposition always non observable (in pointer basis)?

CNOT Gate in Pauli Basis

Macroscopic quantumness and decoherence

Dephasing noise as a decoherence model - Effect on a generalized GHZ state

Interpreting a Density Matrix Resulting from Decoherence of a generalized GHZ State

How to derive the reduced density matrix in a mathematically precise and correct way

Have often named "applications of quantum physics" existed before the theory itself?

Millikan experiment: calculating $e$

Einstein notation and writing down the geodesic equation - a misunderstanding?

Definition of tensor product in Nielsen & Chuang "Quantum Computation and Quantum Information"

Defining the Inner Product for Product-Hilbert Spaces

Christoffel Symbols of a parallel shift

Thought experiments - a didactic tool?

How to prove that every mixed one-qubit state admits a Bloch-sphere representation? [duplicate]

Does this derivation of the reduced density matrix really prove it containing "all measurement statistics"?

How do different $|\text{Alive}\rangle+|\text{Dead}\rangle$ kind of states behave under decoherence?

Coherence and superposition principle - equivalent properties?

Is there a mistake in this paper when calculating the reduced density matrix (simple model)?

Where does the definition of partial trace as ${\rm Tr}_b(O)=\sum_j(I\otimes \langle b_j|)O(I\otimes|b_j\rangle)$ come from?

Gaussian Decoherence - How to (mathematically) arrive at this statement?

Conservation of Angular Momentum during a bike or motorcycle jump

Calculating wheel loads on a motorcycle / car / bike [closed]

What do Paz and Zurek mean by "one-bit" measurement in Heiss' Fundamentals of Quantum Information?

What does Leggett mean by quantum states like $|\psi\rangle=(a|\psi_1\rangle+b|\psi_2\rangle)^N$?

Von Neumann measurement - the only reasonable way to describe a measurement?

The Schrödinger-Equation. A linear differential equation of what order?

Quantum coherence - what is it's definition?

Why are smartphone antennas not $\lambda/2$ of the wavelength? Why are patch-antennas used instead of simple dipole antennas? [closed]