|
| related topics |
| {states, state, optimal} |
| {state, states, coherent} |
| {state, phys, rev} |
| {information, entropy, channel} |
| {state, states, entangled} |
| {light, field, probe} |
| {bell, inequality, local} |
| {phase, path, phys} |
|
Superbroadcasting of conjugate quantum variables
Giacomo M. D'Ariano, Paolo Perinotti, Massimiliano F. Sacchi
abstract: 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.
- oai_identifier:
- oai:arXiv.org:quant-ph/0602037
- categories:
- quant-ph
- comments:
- 7 pages, 1 eps figures. Accepted for publication on Europhysics
Letters
- doi:
- 10.1209/epl/i2006-10105-x
- arxiv_id:
- quant-ph/0602037
- journal_ref:
- Europhys. Lett. 75, 195 (2006)
- created:
- 2006-02-03
- updated:
- 2006-05-19
Full article ▸
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