Physics – Quantum Physics
Scientific paper
2009-02-02
Phys. Rev. A 80, 010302(R) (2009)
Physics
Quantum Physics
4 pages, 2 figures
Scientific paper
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 quantity of information released. Here we introduce a new variant Quantum Private Query algorithm which 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.
Giovannetti Vittorio
Lloyd Seth
Maccone Lorenzo
Martini Francesco de
Nagali Eleonora
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