Protective Measurements: Probing Single Quantum Systems
Tabish Qureshi (Center for Theoretical Physics, JMI, Delhi), N.D. Hari, Dass (TIFR-TCIS, Hyderabad)
TL;DR
Protective measurements offer a novel approach to measure single quantum systems and extract information without destroying the state, challenging traditional views on quantum measurement limitations.
Contribution
The paper describes protective measurements in both original and generalized forms, analyzing entanglement and proposing experimental tests.
Findings
Protective measurements can measure single quantum systems without destroying the state.
The entanglement between system and apparatus can be minimized in protective measurements.
An experimental test for protective measurements is feasible.
Abstract
Making measurements on single quantum systems is considered difficult, almost impossible if the state is a-priori unknown. Protective measurements suggest a possibility to measure single quantum systems and gain some new information in the process. Protective measurement is described, both in the original and generalized form. The degree to which the system and the apparatus remain entangled in a protective measurement, is assessed. A possible experimental test of protective measurements is discussed.
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