Cloning of Gaussian states by linear optics

Journal Article · Thu Jun 15 00:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.73.0· OSTI ID:20787476

Olivares, Stefano; Paris, Matteo G. A.; Andersen, Ulrik L ^[1]

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1. Dipartimento di Fisica dell'Universita degli Studi di Milano (Italy)

We analyze in details a scheme for cloning of Gaussian states based on linear optical components and homodyne detection recently demonstrated by Andersen et al. [Phys. Rev. Lett. 94, 240503 (2005)]. The input-output fidelity is evaluated for a generic (pure or mixed) Gaussian state taking into account the effect of nonunit quantum efficiency and unbalanced mode mixing. In addition, since in most quantum information protocols the covariance matrix of the set of input states is not perfectly known, we evaluate the average cloning fidelity for classes of Gaussian states with the degree of squeezing and the number of thermal photons being only partially known.

• OSTI ID: 20787476
• Journal Information: Physical Review. A, Vol. 73, Issue 6; Other Information: DOI: 10.1103/PhysRevA.73.062330; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CLONING
DETECTION
ENERGY LEVELS
INFORMATION THEORY
OPTICS
PHOTONS
QUANTUM EFFICIENCY
QUANTUM INFORMATION
QUANTUM MECHANICS