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Speed-Accuracy Trade-Off Relations in Quantum Measurements and Computations (2405.15291v2)

Published 24 May 2024 in cond-mat.stat-mech and quant-ph

Abstract: In practical measurements, it is widely recognized that reducing the measurement time leads to decreased accuracy. However, whether an inherent speed-accuracy trade-off exists as a fundamental physical constraint for quantum measurements is not obvious, and the answer remains unknown. Here, we establish a fundamental speed-accuracy trade-off relation based on the energy conservation law and the locality. Our trade-off works as a no-go theorem that the zero-error measurement for the operators that are non-commutative with the Hamiltonian cannot be implemented with finite time. This relation universally applies to various existing errors and disturbances defined for quantum measurements. We furthermore apply our methods to quantum computations and provide another speed-accuracy trade-off relation for unitary gate implementations, which works as another no-go theorem that any error-less implementations of quantum computation gates changing energy cannot be implemented with finite time, and a speed-disturbance trade-off for general quantum operations.

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