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Title: Experimental quantum private queries with linear optics

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [2] ; ; ;  [1]
  1. Dipartimento di Fisica, dell'Universita 'La Sapienza', Roma 00185 (Italy)
  2. (Italy)
  3. NEST-CNR-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa (Italy)
  4. MIT, RLE, and Department of Mechanical Engineering, MIT 3-160, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139 (United States)
  5. Institute for Scientific Interchange, 10133 Torino (Italy)
Publication Date:
OSTI Identifier:
21313168
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 80; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevA.80.010302; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALGORITHMS; COMMUNICATIONS; IMPLEMENTATION; INFORMATION THEORY; OPTICS; PHOTONS; POLARIZATION; QUANTUM COMPUTERS; QUANTUM CRYPTOGRAPHY; QUBITS