dorsal/arxiv
View SchemaScaling of Decoherence Effects in Quantum Computers
| Authors | B. J. Dalton |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0209071 |
| URL | https://arxiv.org/abs/quant-ph/0209071 |
| DOI | 10.1080/09500340308234544 |
| Journal | J. Mod. Opt. 50, 951 (2003) |
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.
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"abstract": "The scaling of decoherence rates with the number of q-bits is studied for a\nsimple quantum computer model. Two state q-bits are localised around\nwell-separated positions via trapping potentials, but vibrational motion of\nq-bits centre of mass motion occurs. Coherent one and two q-bit gating\nprocesses are controlled by external classical fields and facilitated by a high\nQ cavity mode. Decoherence due to q-bit and cavity mode coupling to a bath of\nspontaneous emission modes, cavity decay modes and to the vibrational modes is\ntreated. A non-Markovian treatment of the short time behaviour of the fidelity\nis presented, enabling time scales for decoherence to be determined, together\nwith their dependence on q-bit number for the case where the q-bit/cavity mode\nsystem is in a pure state and the baths are in thermal states.",
"arxiv_id": "quant-ph/0209071",
"authors": [
"B. J. Dalton"
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"categories": [
"quant-ph"
],
"doi": "10.1080/09500340308234544",
"journal_ref": "J. Mod. Opt. 50, 951 (2003)",
"title": "Scaling of Decoherence Effects in Quantum Computers",
"url": "https://arxiv.org/abs/quant-ph/0209071"
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