MathDB2 problems
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No-go conjecture for time-reversal symmetries of quantum channels
A quantum channel is a quantum operation that preserves the appropriate normalization condition, and a time-reversal symmetry is a symmetry implementing time reversal on the releva…
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Impossibility of extending time reversal to all quantum channels
A quantum operation is a completely positive trace-preserving map, and a quantum channel is such an operation between quantum systems. For unitary dynamics, time reversal is given…