Use this tag for questions related to CPT symmetry, as relevant to quantum computing or quantum information theory. Charge, parity, and time reversal symmetry is a fundamental symmetry of physical laws under the simultaneous transformations of charge conjugation (C), parity transformation (P), and time reversal (T). CPT is the only combination of C, P, and T that is observed to be an exact symmetry of nature at the fundamental level (Wikipedia).
Questions tagged [cpt-symmetry]
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Eigenvalues of CPT operator
Suppose we define an operator CPT that carries out the CPT transformation:
$$\text{CPT}|\Psi\rangle = A|\Psi\rangle$$
where A is just a constant. Or put another way, the states of our theory are eigenfunctions of the CPT operator. -Source
What…
user820789
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What is the "CP" operation in the context of anti-particles?
In this question on Quora: What is meant by "the photon is its own antiparticle"?, an answer is given which states:
In quantum theory, we have a procedure for transforming the wave function of a particle into that of an antiparticle. It is called…
user820789
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How to test matrix Hamiltonians for CPT symmetry
So I have recently learned how to time evolve systems subject to non-Hermitian Hamiltonians using left and right eigenvectors. Basically to construct my non-Hermitian Hamiltonian, I use all real eigenvalues as well as eigenvectors that are linearly…
Christopher Timms
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Classical electronics controls from both sides - could we do it for some quantum electronics?
In classical electronics we actively pull and push electrons by electric field - could we get such two-way control for some quantum electronics?
For example silicon quantum dots - for state preparation they use impulse of electric field to tunnel…
Jarek Duda
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What happens with qubits which are not measured (readout) in superconducting quantum computer?
The treatment of unused qubits is far from trivial, e.g. Shor requires "to uncompute" them - I wanted to ask what happens with qubits that are not measured in superconducting QC?
If I understand properly, in superconducting QC due to extremely low…
Jarek Duda
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