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Density-operator
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Are density matrices symmetric?
August 1st, 2022
statistical-mechanics
quantum-information
density-operator
quantum-mechanics
trace
Replica trick for calculating Entanglement Entropy?
January 5th, 2021
quantum-entanglement
entropy
statistical-mechanics
quantum-mechanics
density-operator
Proof that you can't disentangle two parties if you only operate on one
August 1st, 2022
quantum-measurements
quantum-information
quantum-mechanics
quantum-entanglement
density-operator
Interpretation of a density matrix as an observable
July 21st, 2020
density-operator
quantum-mechanics
Why can't the off-diagonal terms in density operators of pure states be always removed?
May 30th, 2020
density-operator
quantum-mechanics
Methods to distinguish between pure/mixed states and entangled/separable states
February 14th, 2020
hilbert-space
density-operator
quantum-states
quantum-entanglement
quantum-mechanics
Density matrix: error with diagonalization claim and fixing it
October 14th, 2020
hilbert-space
density-operator
quantum-mechanics
Finding the matrix representation of a superoperator
August 1st, 2022
quantum-mechanics
operators
quantum-information
linear-algebra
density-operator
Liouville-von Neumann equation can be directly derived from Heisenberg picture?
January 27th, 2022
density-operator
quantum-mechanics
Is a partial trace cyclic?
August 1st, 2022
quantum-information
trace
quantum-mechanics
operators
density-operator
If an isolated quantum system consists of only one particle, is it possible for it to be in a mixed state?
June 14th, 2020
thermodynamics
density-operator
quantum-information
quantum-mechanics
Lindblad and Input-Output Formalism in Quantum Optics
November 2nd, 2020
open-quantum-systems
research-level
quantum-optics
density-operator
cavity-qed
What is a Gibbs state?
September 24th, 2020
quantum-mechanics
density-operator
partition-function
statistical-mechanics
hilbert-space
Why does the density matrix $\rho$ obey a wrong-signed Heisenberg equation of motion?
August 1st, 2022
density-operator
schroedinger-equation
quantum-mechanics
conventions
time-evolution
What is quantum entanglement?
December 4th, 2020
quantum-entanglement
density-operator
definition
quantum-mechanics
hilbert-space
Examples of density operators $\rho=\sum\limits_n p_n|\phi_n\rangle\langle\phi_n|$ in which the states $\{|\phi_n\rangle\}$ are not orthogonal
August 8th, 2020
quantum-statistics
quantum-mechanics
statistical-mechanics
quantum-information
density-operator
What is the Reduced Density Matrix?
April 19th, 2021
density-operator
quantum-information
quantum-entanglement
Trace of an operator matrix (Quantum computation and quantum information)
August 1st, 2022
quantum-mechanics
quantum-information
quantum-computer
linear-algebra
density-operator
Is there a clear and intuitive meaning to the eigenvectors and eigenvalues of a density matrix?
December 31st, 2020
quantum-mechanics
quantum-information
hilbert-space
probability
density-operator
Why can't every quantum state be expressed as a density matrix/operator?
June 3rd, 2020
quantum-states
quantum-mechanics
quantum-field-theory
hilbert-space
density-operator
Reduced density matrices for free fermions are thermal
December 31st, 2020
quantum-field-theory
statistical-mechanics
research-level
quantum-entanglement
density-operator
Schrödinger's cat and the difficulty of macroscopic superposition state
December 21st, 2020
schroedingers-cat
density-operator
decoherence
superposition
quantum-mechanics
Is purification physicaly meaningful?
August 22nd, 2020
hilbert-space
quantum-information
density-operator
quantum-mechanics
Lindblad equation for heisenberg operators?
January 16th, 2021
density-operator
open-quantum-systems
Intuition on positive-operator valued measures (POVM)
October 12th, 2020
operators
quantum-information
quantum-mechanics
density-operator
Hilbert-Schmidt basis for many qubits - reference
December 25th, 2020
specific-reference
density-operator
research-level
quantum-information
quantum-mechanics
Why is Schrödinger's cat in a superposition and not a mixture if you model decay with Fermi's golden rule?
February 24th, 2021
fermis-golden-rule
quantum-mechanics
superposition
density-operator
schroedingers-cat
Does correlation of the measurement outcomes imply that a state is entangled?
July 24th, 2020
hilbert-space
quantum-entanglement
density-operator
quantum-mechanics
quantum-information
Green functions and density matrix
March 18th, 2021
quantum-mechanics
density-operator
greens-functions
Is the density operator a mathematical convenience or a 'fundamental' aspect of quantum mechanics?
November 21st, 2020
quantum-mechanics
density-operator
foundations
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