Conditional sign flip via teleportation

Journal Article · Sun Aug 01 00:00:00 EDT 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.70.022319· OSTI ID:20645864

Giorgi, Gian Luca; Pasquale, Ferdinando de ^[1]; Paganelli, Simone ^[2]

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1. INFM Center for Statisical Mechanics and Complexity, 00185 Rome (Italy)
2. Dipartimento di Fisica, Universita di Roma La Sapienza, Piazzale A. Moro 2, 00185 Rome (Italy)

We present a model to realize a probabilistic conditional sign flip gate using only linear optics. The gate operates in the space of number-state qubits and is obtained by a nonconventional use of the teleportation protocol. Both a destructive and a nondestructive version of the gate are presented. In the former case an Hadamard gate on the control qubit is combined with a projective teleportation scheme mixing control and target. The success probability is 1/2. In the latter case we need a quantum encoder realized via the interaction of the control qubit with an ancillary state composed of two maximally entangled photons. The success probability is 1/4.

• OSTI ID: 20645864
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 70; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CONTROL
CORRELATIONS
ENERGY LEVELS
GATING CIRCUITS
MIXING
OPTICS
PHOTONS
PROBABILISTIC ESTIMATION
PROBABILITY
QUANTUM MECHANICS