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Experimental linear-optical implementation of a multifunctional optimal qubit cloner
- Source :
- Phys. Rev. A 85, 050307(R) (2012)
- Publication Year :
- 2012
-
Abstract
- We present the first experimental implementation of a multifunctional device for the optimal cloning of one to two qubits. Previous implementations have always been designed to optimize the cloning procedure with respect to one single type of a priori information about the cloned state. In contrast, our "all-in-one" implementation is optimal for several prominent regimes such as universal cloning, phase-covariant cloning, and also the first ever realized mirror phase-covariant cloning, when the square of the expected value of Pauli's Z operator is known in advance. In all these regimes the experimental device yields clones with almost maximum achievable average fidelity (97.5% of theoretical limit). Our device has a wide range of possible applications in quantum information processing, especially in quantum communication. For instance, one can use it for incoherent and coherent attacks against a variety of cryptographic protocols, including the Bennett-Brassard 1984 protocol of quantum key distribution through the Pauli damping channels. It can be also applied as a state-dependent photon multiplier in practical quantum networks.<br />Comment: 9 pages, 6 figures, accepted to Phys. Rev. A (Rapid Communications)
- Subjects :
- Quantum Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. A 85, 050307(R) (2012)
- Publication Type :
- Report
- Accession number :
- edsarx.1201.6234
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevA.85.050307