Null values and quantum state discrìmination

Oded Zilberberg*, Alessandro Romito, David J. Starling, Gregory A. Howland, Curtis J. Broadbent, John C. Howell, Yuval Gefen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


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.

Original languageAmerican English
Article number170405
JournalPhysical Review Letters
Issue number17
StatePublished - 25 Apr 2013
Externally publishedYes


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