dorsal/arxiv
View SchemaAll-Optical Measurement Based QIP in Quantum Dots
| Authors | Avinash Kolli, Brendon W. Lovett, Simon C. Benjamin, Thomas M. Stace |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0607028 |
| URL | https://arxiv.org/abs/quant-ph/0607028 |
| DOI | 10.1103/PhysRevLett.97.250504 |
| Journal | Phys. Rev. Lett. 97, 250504 (2006) |
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.
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"abstract": "Parity measurements on qubits can generate the entanglement resource\nnecessary for scalable quantum computation. Here we describe a method for fast\noptical parity measurements on electron spin qubits within coupled quantum\ndots. The measurement scheme, which can be realised with existing technology,\nconsists of the optical excitation of excitonic states followed by monitored\nrelaxation. Conditional on the observation of a photon, the system is projected\ninto the odd/even parity subspaces. Our model incorporates all the primary\nsources of error, including detector inefficiency, effects of spatial\nseparation and non-resonance of the dots, and also unwanted excitations.\nThrough an analytical treatment we establish that the scheme is robust to such\neffects. Two applications are presented: a realisation of a CNOT gate, and a\ntechnique for growing large scale graph states.",
"arxiv_id": "quant-ph/0607028",
"authors": [
"Avinash Kolli",
"Brendon W. Lovett",
"Simon C. Benjamin",
"Thomas M. Stace"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevLett.97.250504",
"journal_ref": "Phys. Rev. Lett. 97, 250504 (2006)",
"title": "All-Optical Measurement Based QIP in Quantum Dots",
"url": "https://arxiv.org/abs/quant-ph/0607028"
},
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