|
| related topics |
| {time, decoherence, evolution} |
| {trap, ion, state} |
| {qubit, qubits, gate} |
| {spin, pulse, spins} |
| {error, code, errors} |
| {equation, function, exp} |
| {operator, operators, space} |
| {state, phys, rev} |
| {let, theorem, proof} |
| {cos, sin, state} |
| {observables, space, algebra} |
|
Encoded Recoupling and Decoupling: An Alternative to Quantum Error
Correcting Codes, Applied to Trapped Ion Quantum Computation
D. A. Lidar, L. -A Wu
abstract: A recently developed theory for eliminating decoherence and design
constraints in quantum computers, ``encoded recoupling and decoupling'', is
shown to be fully compatible with a promising proposal for an architecture
enabling scalable ion-trap quantum computation [D. Kielpinski et al., Nature
417, 709 (2002)]. Logical qubits are encoded into pairs of ions. Logic gates
are implemented using the Sorensen-Molmer (SM) scheme applied to pairs of ions
at a time. The encoding offers continuous protection against collective
dephasing. Decoupling pulses, that are also implemented using the SM scheme
directly to the encoded qubits, are capable of further reducing various other
sources of qubit decoherence, such as due to differential dephasing and due to
decohered vibrational modes. The feasibility of using the relatively slow SM
pulses in a decoupling scheme quenching the latter source of decoherence
follows from the observed 1/f spectrum of the vibrational bath.
- oai_identifier:
- oai:arXiv.org:quant-ph/0211088
- categories:
- quant-ph
- comments:
- 12 pages, no figures
- doi:
- 10.1103/PhysRevA.67.032313
- arxiv_id:
- quant-ph/0211088
- journal_ref:
- Phys. Rev. A 67, 032313 (2003)
- created:
- 2002-11-14
Full article ▸
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