|
| related topics |
| {time, decoherence, evolution} |
| {qubit, qubits, gate} |
| {state, states, coherent} |
| {cavity, atom, atoms} |
| {temperature, thermal, energy} |
| {trap, ion, state} |
| {level, atom, field} |
| {state, phys, rev} |
| {field, particle, equation} |
| {entanglement, phys, rev} |
| {cos, sin, state} |
|
Scaling of Decoherence Effects in Quantum Computers
B. J. Dalton
abstract: The scaling of decoherence rates with the number of q-bits is studied for a
simple quantum computer model. Two state q-bits are localised around
well-separated positions via trapping potentials, but vibrational motion of
q-bits centre of mass motion occurs. Coherent one and two q-bit gating
processes are controlled by external classical fields and facilitated by a high
Q cavity mode. Decoherence due to q-bit and cavity mode coupling to a bath of
spontaneous emission modes, cavity decay modes and to the vibrational modes is
treated. A non-Markovian treatment of the short time behaviour of the fidelity
is presented, enabling time scales for decoherence to be determined, together
with their dependence on q-bit number for the case where the q-bit/cavity mode
system is in a pure state and the baths are in thermal states.
- oai_identifier:
- oai:arXiv.org:quant-ph/0209071
- categories:
- quant-ph
- comments:
- 18 pages, 1 figure, modified intro, added refs, corrected typos,
further revisions to J Mod Opt galley proofs
- arxiv_id:
- quant-ph/0209071
- created:
- 2002-09-10
- updated:
- 2003-01-17
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