5 September 2008 Deterministic minimum disturbance quantum measurement
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We demonstrate a linear optical device which performs optimal quantum measurement or minimum disturbance measurement on a single-photon polarization qubit with the help of an ancillary path qubit introduced to the same photon. We show theoretically and experimentally that this device satisfies the minimum disturbance measurement condition by investigating the relation between the information gain (estimation fidelity) and the state disturbance due to measurement (operation fidelity). Our implementation of minimal disturbance measurement is postselection-free in the sense that all detection events are counted toward evaluation of the estimation fidelity and the operation fidelity, i.e., there is no need for coincidence postselection of the detection events.
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So-Young Baek, So-Young Baek, Yong Wook Cheong, Yong Wook Cheong, Yoon-Ho Kim, Yoon-Ho Kim, } "Deterministic minimum disturbance quantum measurement", Proc. SPIE 7092, Quantum Communications and Quantum Imaging VI, 70920U (5 September 2008); doi: 10.1117/12.794379; https://doi.org/10.1117/12.794379

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