Superbroadcasting of harmonic oscillators mixed states |
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Authors: | G. M. D’Ariano P. Perinotti M. F. Sacchi |
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Affiliation: | (1) Dipartimento di Fisica “A. Volta” and CNISM, I-27100 Pavia, Italy;(2) Dipartimento di Fisica “A. Volta” and CNISM, via Bassi 6, I-27100 Pavia, Italy;(3) CNR-Istituto Nazionale per la Fisica della Materia, Unità di Pavia, Italy |
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Abstract: | We consider the problem of broadcasting quantum information encoded in the displacement parameter for an harmonic oscillator, from N to M > N copies of a thermal state. We show the Weyl-Heisenberg covariant broadcasting map that optimally reduces the thermal photon number, and we prove that it minimizes the noise in conjugate quadratures at the output for general input states. We find that from two input copies broadcasting is feasible, with the possibility of simultaneous purification (superbroadcasting). The text was submitted by the authors in English. |
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