Superbroadcasting of conjugate quantum variables

Details Superbroadcasting of conjugate quantum variables Superbroadcasting of conjugate quantum variables

2006-02-03

arxiv.org/abs/quant-ph/0602037v2

Europhys. Lett. 75, 195 (2006)

Physics

Quantum Physics

7 pages, 1 eps figures. Accepted for publication on Europhysics Letters

Scientific paper

10.1209/epl/i2006-10105-x

We consider the problem of broadcasting arbitrary states of radiation modes from N to M>N copies by a map that preserves the average value of the field and optimally reduces the total noise in conjugate variables. For N>=2 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. M<=N), 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.

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