dorsal/arxiv
View SchemaEncoded Recoupling and Decoupling: An Alternative to Quantum Error Correcting Codes, Applied to Trapped Ion Quantum Computation
| Authors | D. A. Lidar, L. -A Wu |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0211088 |
| URL | https://arxiv.org/abs/quant-ph/0211088 |
| DOI | 10.1103/PhysRevA.67.032313 |
| Journal | Phys. Rev. A 67, 032313 (2003) |
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.
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"abstract": "A recently developed theory for eliminating decoherence and design\nconstraints in quantum computers, ``encoded recoupling and decoupling\u0027\u0027, is\nshown to be fully compatible with a promising proposal for an architecture\nenabling scalable ion-trap quantum computation [D. Kielpinski et al., Nature\n417, 709 (2002)]. Logical qubits are encoded into pairs of ions. Logic gates\nare implemented using the Sorensen-Molmer (SM) scheme applied to pairs of ions\nat a time. The encoding offers continuous protection against collective\ndephasing. Decoupling pulses, that are also implemented using the SM scheme\ndirectly to the encoded qubits, are capable of further reducing various other\nsources of qubit decoherence, such as due to differential dephasing and due to\ndecohered vibrational modes. The feasibility of using the relatively slow SM\npulses in a decoupling scheme quenching the latter source of decoherence\nfollows from the observed 1/f spectrum of the vibrational bath.",
"arxiv_id": "quant-ph/0211088",
"authors": [
"D. A. Lidar",
"L. -A Wu"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.67.032313",
"journal_ref": "Phys. Rev. A 67, 032313 (2003)",
"title": "Encoded Recoupling and Decoupling: An Alternative to Quantum Error Correcting Codes, Applied to Trapped Ion Quantum Computation",
"url": "https://arxiv.org/abs/quant-ph/0211088"
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