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Unitarity
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Quantum mechanics - how can the energy be complex?
February 8th, 2020
quantum-mechanics
quasiparticles
unitarity
complex-numbers
energy
Why is information indestructible?
August 27th, 2020
black-holes
entropy
information
holographic-principle
unitarity
Is there a symmetry associated to the conservation of information?
January 3rd, 2020
quantum-mechanics
quantum-field-theory
quantum-information
noethers-theorem
unitarity
Why is the information paradox restricted to black holes?
December 27th, 2020
unitarity
hawking-radiation
information
black-holes
thermodynamics
Why do we not have spin greater than 2?
August 1st, 2022
higher-spin
s-matrix-theory
unitarity
quantum-spin
quantum-field-theory
Unitary quantum field theory
September 30th, 2021
s-matrix-theory
quantum-field-theory
hilbert-space
definition
unitarity
Is general relativity holonomic?
April 20th, 2020
general-relativity
hamiltonian-formalism
unitarity
Where does the $i$ come from in the Schrödinger equation?
August 1st, 2022
quantum-mechanics
hamiltonian
schroedinger-equation
unitarity
operators
Why is the Yang-Mills gauge group assumed compact and semi-simple?
February 10th, 2021
gauge-theory
quantum-field-theory
unitarity
yang-mills
group-theory
A wave function that is normalized initially remains normalized
November 6th, 2020
homework-and-exercises
normalization
quantum-mechanics
unitarity
wavefunction
What is unitarily similar matrices?
February 20th, 2020
unitarity
dirac-matrices
Applying controlled Hadamard gate
June 13th, 2020
unitarity
homework-and-exercises
quantum-mechanics
quantum-information
Prove that this operator is unitary
August 1st, 2022
quantum-mechanics
homework-and-exercises
operators
fourier-transform
unitarity
When is a unitary operator a quantum gate?
August 1st, 2022
unitarity
quantum-information
Going to the interaction picture in the Jaynes–Cummings model
April 11th, 2020
quantum-mechanics
unitarity
hamiltonian
operators
homework-and-exercises
Constructing the exponential form of a unitary operator
April 14th, 2020
unitarity
quantum-mechanics
operators
mathematical-physics
commutator
Importance of local conservation of probability
June 1st, 2020
quantum-field-theory
quantum-mechanics
unitarity
probability
conservation-laws
How to find unitary matrices?
May 16th, 2020
homework-and-exercises
operators
unitarity
quantum-mechanics
Shankar's Active/Passive Change of Basis
August 1st, 2022
unitarity
linear-algebra
quantum-mechanics
Why first-order Born Approximation doesn't satisfy optical theorem?
August 1st, 2022
born-oppenheimer-approximation
s-matrix-theory
unitarity
perturbation-theory
quantum-mechanics
What do we mean by Unitary Dynamics in Quantum Computing?
June 15th, 2020
probability
unitarity
quantum-information
quantum-mechanics
Equivalence of symmetry and commuting unitary operator
December 22nd, 2020
quantum-mechanics
symmetry
hamiltonian
unitarity
Schrödinger equation and non-Hermitian Hamiltonians
August 1st, 2022
operators
quantum-mechanics
unitarity
hamiltonian
schroedinger-equation
Why does Hamiltonian follow the property $H^*_{ij} = H_{ji} $?
August 1st, 2022
time-evolution
quantum-mechanics
probability
hamiltonian
unitarity
About Boltzmann H-theorem
December 14th, 2020
quantum-field-theory
reversibility
unitarity
entropy
statistical-mechanics
What does it mean for the Hamiltonian to not be bounded from below?
August 1st, 2022
hamiltonian
unitarity
quantum-field-theory
Prove time-dependent hamiltonian is hermitian from unitarity of time-evolution operator
December 19th, 2020
quantum-mechanics
unitarity
time-evolution
schroedinger-equation
operators
What does the continuity equation for probability in quantum mechanics mean?
November 16th, 2020
unitarity
probability
quantum-mechanics
Time ordering operator and derivative with respect to time
October 6th, 2020
operators
unitarity
quantum-field-theory
quantum-mechanics
time-evolution
Matrix for $\pi/2$ pulse?
April 2nd, 2020
two-level-system
quantum-information
quantum-optics
quantum-mechanics
unitarity
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