|
| related topics |
| {state, phys, rev} |
| {spin, pulse, spins} |
| {time, decoherence, evolution} |
| {photon, photons, single} |
| {level, atom, field} |
| {measurement, state, measurements} |
| {qubit, qubits, gate} |
| {trap, ion, state} |
| {operator, operators, space} |
| {error, code, errors} |
| {cos, sin, state} |
| {energy, state, states} |
|
All-Optical Measurement Based QIP in Quantum Dots
Avinash Kolli, Brendon W. Lovett, Simon C. Benjamin, Thomas M. Stace
abstract: Parity measurements on qubits can generate the entanglement resource
necessary for scalable quantum computation. Here we describe a method for fast
optical parity measurements on electron spin qubits within coupled quantum
dots. The measurement scheme, which can be realised with existing technology,
consists of the optical excitation of excitonic states followed by monitored
relaxation. Conditional on the observation of a photon, the system is projected
into the odd/even parity subspaces. Our model incorporates all the primary
sources of error, including detector inefficiency, effects of spatial
separation and non-resonance of the dots, and also unwanted excitations.
Through an analytical treatment we establish that the scheme is robust to such
effects. Two applications are presented: a realisation of a CNOT gate, and a
technique for growing large scale graph states.
- oai_identifier:
- oai:arXiv.org:quant-ph/0607028
- categories:
- quant-ph
- comments:
- 4 pages, 3 figures. To be published in PRL
- arxiv_id:
- quant-ph/0607028
- journal_ref:
- Phys. Rev. Lett. 97, 250504 (2006)
- created:
- 2006-07-04
- updated:
- 2006-11-24
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