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Null values and quantum state discrìmination

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • Oded Zilberberg
  • Alessandro Romito
  • David J. Starling
  • Gregory A. Howland
  • Curtis J. Broadbent
  • John C. Howell
  • Yuval Gefen
Article number170405
<mark>Journal publication date</mark>25/04/2013
<mark>Journal</mark>Physical review letters
Issue number17
Publication StatusPublished
<mark>Original language</mark>English


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.