Experimental quantum private queries with linear optics

Journal Article · Wed Jul 15 00:00:00 EDT 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.80.010302· OSTI ID:21313168

De Martini, Francesco ^[1]; Giovannetti, Vittorio ^[2]; Lloyd, Seth ^[3]; Maccone, Lorenzo ^[4]; Nagali, Eleonora; Sansoni, Linda; Sciarrino, Fabio ^[1]

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1. Dipartimento di Fisica, dell'Universita 'La Sapienza', Roma 00185 (Italy)
2. NEST-CNR-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa (Italy)
3. MIT, RLE, and Department of Mechanical Engineering, MIT 3-160, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139 (United States)
4. Institute for Scientific Interchange, 10133 Torino (Italy)

The quantum private query is a quantum cryptographic protocol to recover information from a database, preserving both user and data privacy: the user can test whether someone has retained information on which query was asked and the database provider can test the amount of information released. Here we discuss a variant of the quantum private query algorithm that admits a simple linear optical implementation: it employs the photon's momentum (or time slot) as address qubits and its polarization as bus qubit. A proof-of-principle experimental realization is implemented.

• OSTI ID: 21313168
• Journal Information: Physical Review. A, Vol. 80, Issue 1; Other Information: DOI: 10.1103/PhysRevA.80.010302; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALGORITHMS
COMMUNICATIONS
IMPLEMENTATION
INFORMATION THEORY
OPTICS
PHOTONS
POLARIZATION
QUANTUM COMPUTERS
QUANTUM CRYPTOGRAPHY
QUBITS