Hypothesis testing for an entangled state produced by spontaneous parametric down-conversion

Journal Article · Fri Dec 15 04:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.062321· OSTI ID:20976450

Hayashi, Masahito ^[1]; Shi, B -S; Jiang, Y -K ^[1]; Tomita, Akihisa ^[1]; Matsumoto, Keiji ^[1]; Tsuda, Yoshiyuki ^[2]

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1. ERATO Quantum Computation and Information Project, Japan Science and Technology Agency (JST), Tokyo 113-0033 (Japan)
2. COE, Chuo University, Kasuga, Bunkyo-ku, Tokyo 112-8551 (Japan)

Generation and characterization of entanglement are crucial tasks in quantum information processing. A hypothesis testing scheme for entanglement has been formulated. Three designs were proposed to test the entangled photon states created by the spontaneous parametric down conversion. The time allocations between the measurement vectors were designed to consider the anisotropic deviation of the generated photon states from the maximally entangled states. The designs were evaluated in terms of the p value based on the observed data. It has been experimentally demonstrated that the optimal time allocation between the coincidence and anticoincidence measurement vectors improves the entanglement test. A further improvement is also experimentally demonstrated by optimizing the time allocation between the anticoincidence vectors. Analysis on the data obtained in the experiment verified the advantage of the entanglement test designed by the optimal time allocation.

• OSTI ID: 20976450
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 74; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
ANTICOINCIDENCE
DATA PROCESSING
INFORMATION THEORY
OPTIMIZATION
PHOTONS
QUANTUM ENTANGLEMENT
QUANTUM INFORMATION
QUANTUM MECHANICS