Null values and quantum state discrìmination

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

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 languageEnglish (US)
Article number170405
JournalPhysical review letters
Issue number17
StatePublished - Apr 25 2013

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


Dive into the research topics of 'Null values and quantum state discrìmination'. Together they form a unique fingerprint.

Cite this