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seen May 21 at 1:59

Apr
10
answered What type of Quantum Gate is this
Apr
9
comment Is there a simple expression for the coherent information of a Pauli channel?
By $H(\Lambda)$ I mean the entropy of the Choi matrix. So in the case of a Pauli channel $H(\Lambda)=-\Sigma P_i Log(P_i)$ A couple of the places it seems like this is assumed to be true are: here here and here
Apr
8
asked Is there a simple expression for the coherent information of a Pauli channel?
Feb
20
awarded  Scholar
Feb
20
accepted Is a quantum channel well behaved under a perturbation of its Choi matrix?
Feb
18
asked Is a quantum channel well behaved under a perturbation of its Choi matrix?
Jan
12
comment Topological entanglement entropy only defined for a system in the ground state?
Here is a free version of the paper linked above (arxiv.org/abs/0704.3616)
Nov
23
revised Trace of the number operator in second quantization
corrected mathematical mistakes
Nov
23
revised Trace of the number operator in second quantization
added 129 characters in body
Nov
23
comment Trace of the number operator in second quantization
and I made a mistake in using the identity $det(e^A)=e^{Tr(A)}$. I'll have to change the phrasing of my question, since I'm still curious about the trace of the number operator.
Nov
23
comment Trace of the number operator in second quantization
You're right, there is no T in the Hamiltonian, that was a mistake.
Nov
22
asked Trace of the number operator in second quantization
Jul
21
awarded  Revival
May
10
awarded  Supporter
Mar
26
comment Why should multiple versions of a weak measurement preclude it from being a measurement of intrinsic properties of some system
So suppose we conclude that what is measured in weak measurement is some combined property of the system of interest and the meter system. Is Parrott's criticism ultimately that one could never consistently devise a protocol for extracting only the information about the system of interest, whether that protocol be setting $\rho$ to 0, or knowing $\rho$ and doing some mathematical manipulation of the data? If that is the case, I am still not certain about what reasoning leads one to that conclusion. If it is not the case, then isn't weak measurement a valid measurement?
Mar
26
awarded  Student
Mar
26
asked Why should multiple versions of a weak measurement preclude it from being a measurement of intrinsic properties of some system
Mar
24
awarded  Editor
Mar
24
revised Cardinality of the Universes Set
added 124 characters in body
Mar
24
answered Cardinality of the Universes Set