Volume 75, Number 2, July 2006
|Page(s)||195 - 201|
|Published online||16 June 2006|
Superbroadcasting of conjugate quantum variables
Dipartimento di Fisica “A. Volta” and CNISM - via Bassi 6, I-27100 Pavia, Italy
2 CNR - Istituto Nazionale per la Fisica della Materia, Unità di Pavia - Italy
Accepted: 29 May 2006
We consider the problem of broadcasting arbitrary states of radiation modes from N to copies by a map that preserves the average value of the field and optimally reduces the total noise in conjugate variables. For the broadcasting can be achieved perfectly, and for sufficiently noisy input states one can even purify the state while broadcasting—the so-called superbroadcasting. For purification (i.e. ), the reduction of noise is independent of M. Similar results are proved for broadcasting with phase-conjugation. All the optimal maps can be implemented by linear optics and linear amplification.
PACS: 03.65.-w – Quantum mechanics / 03.67.-a – Quantum information
© EDP Sciences, 2006
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