|
| related topics |
| {alice, bob, state} |
| {information, entropy, channel} |
| {states, state, optimal} |
| {cos, sin, state} |
| {state, phys, rev} |
| {time, wave, function} |
| {let, theorem, proof} |
| {force, casimir, field} |
| {level, atom, field} |
| {state, states, coherent} |
|
Countering Quantum Noise with Supplementary Classical Information
Jonathan Barrett
abstract: We consider situations in which i) Alice wishes to send quantum information
to Bob via a noisy quantum channel, ii) Alice has a classical description of
the states she wishes to send and iii) Alice can make use of a finite amount of
noiseless classical information. After setting up the problem in general, we
focus attention on one specific scenario in which Alice sends a known qubit
down a depolarizing channel along with a noiseless cbit. We describe a protocol
which we conjecture is optimal and calculate the average fidelity obtained. A
surprising amount of structure is revealed even for this simple case which
suggests that relationships between quantum and classical information could in
general be very intricate.
- oai_identifier:
- oai:arXiv.org:quant-ph/0201073
- categories:
- quant-ph
- comments:
- RevTeX, 5 pages, 2 figures Typo in reference 9 corrected
- doi:
- 10.1103/PhysRevA.68.012303
- arxiv_id:
- quant-ph/0201073
- journal_ref:
- Phys. Rev. A 68, 012303 (2003)
- report_no:
- DAMTP-2002-5
- created:
- 2002-01-17
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