Null values and quantum state discrìmination

Zilberberg, Oded and Romito, Alessandro and Starling, David J. and Howland, Gregory A. and Broadbent, Curtis J. and Howell, John C. and Gefen, Yuval (2013) Null values and quantum state discrìmination. Physical review letters, 110 (17). ISSN 0031-9007

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We present a measurement protocol for discriminating between two different quantum states of a qubit with high fidelity. The protocol, called null value, is comprised of a projective measurement performed on the system with a small probability (also known as partial collapse), followed by a tuned postselection. We report on an optical experimental implementation of the scheme. We show that our protocol leads to an amplified signal-to-noise ratio (as compared with a straightforward strong measurement) when discerning between the two quantum states.

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Journal Article
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Physical review letters
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02 Dec 2019 11:50
Last Modified:
22 Nov 2022 08:27