We propose a physically reversible quantum measurement of an arbitrary spin-ssystem using a spin-j probe via an Ising interaction. In the case of a spin-1/2system (s=1/2), we explicitly construct a reversing measurement and evaluatethe degree of reversibility in terms of fidelity. The recovery of the measuredstate is pronounced when the probe has a high spin (j>1/2), because thefidelity changes drastically during the reversible measurement and thereversing measurement. We also show that the reversing measurement scheme for aspin-1/2 system can serve as an experimentally feasible approximate reversingmeasurement for a high-spin system (s>1/2). If the interaction is sufficientlyweak, the reversing measurement can recover a cat state almostdeterministically in spite of there being a large fidelity change.
展开▼