Null values and quantum state discrìmination

Null values and quantum state discrìmination

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 po...

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Veröffentlicht in:Physical review letters 2013-04, Vol.110 (17), p.170405-170405, Article 170405
Hauptverfasser: Zilberberg, Oded, Romito, Alessandro, Starling, David J, Howland, Gregory A, Broadbent, Curtis J, Howell, John C, Gefen, Yuval
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container_issue 17
container_start_page 170405
container_title Physical review letters
container_volume 110
creator Zilberberg, Oded
Romito, Alessandro
Starling, David J
Howland, Gregory A
Broadbent, Curtis J
Howell, John C
Gefen, Yuval
description 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.
doi_str_mv 10.1103/PhysRevLett.110.170405
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title Null values and quantum state discrìmination
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