Nonmaximally entangled states: Production, characterization, and utilization

Andrew G. White, Daniel F.V. James, Philippe H. Eberhard, Paul G. Kwiat

Research output: Contribution to journalArticlepeer-review


Using a spontaneous-down-conversion photon source, we produce true nonmaximally entangled states, i.e., without the need for postselection. The degree and phase of entanglement are readily tunable, and are characterized both by a standard analysis using coincidence minima, and by quantum state tomography of the two-photon state. Using the latter, we experimentally reconstruct the reduced density matrix for the polarization. Finally, we use these states to measure the Hardy fraction, obtaining a result that is 122σ from any local-realistic result. 1999

Original languageEnglish (US)
Pages (from-to)3103-3107
Number of pages5
JournalPhysical review letters
Issue number15
StatePublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


Dive into the research topics of 'Nonmaximally entangled states: Production, characterization, and utilization'. Together they form a unique fingerprint.

Cite this