Any unital quantum channel on d dimensions admits exact simulation with ancilla dimension k and success probability Ω(k/log d) via randomization and postselection; the bound is tight and fails for strongly non-unital channels.
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quant-ph 2years
2026 2verdicts
UNVERDICTED 2representative citing papers
Optimal entangling measurements on two qubits violate the three-parameter precision trade-off bound by an average of 16 standard deviations, achieving tomography precision unreachable by individual measurements.
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Randomized simulation of quantum channels using small ancilla
Any unital quantum channel on d dimensions admits exact simulation with ancilla dimension k and success probability Ω(k/log d) via randomization and postselection; the bound is tight and fails for strongly non-unital channels.
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Beating three-parameter precision trade-offs with entangling collective measurements
Optimal entangling measurements on two qubits violate the three-parameter precision trade-off bound by an average of 16 standard deviations, achieving tomography precision unreachable by individual measurements.