dorsal/arxiv
View SchemaA switchable controlled-NOT gate in a spin-chain NMR quantum computer
| Authors | Atsushi Goto, Tadashi Shimizu, Kenjiro Hashi, Hideaki Kitazawa |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0205135 |
| URL | https://arxiv.org/abs/quant-ph/0205135 |
| DOI | 10.1103/PhysRevA.67.022312 |
| Journal | Physical Review A 67, 022312 (2003). |
Abstract
A method of switching a controlled-NOT gate in a solid-stae NMR quantum computer is presented. Qubits of I=1/2 nuclear spins are placed periodically along a quantum spin chain (1-D antiferromagnet) having a singlet ground state with a finite spin gap to the lowest excited state caused by some quantum effect. Irradiation of a microwave tuned to the spin gap energy excites a packet of triplet magnons at a specific part of the chain where control and target qubits are involved. The packet switches on the Suhl-Nakamura interaction between the qubits, which serves as a controlled NOT gate. The qubit initialization is achieved by a qubit initializer consisting of semiconducting sheets attached to the spin chain, where spin polarizations created by the optical pumping method in the semiconductors are transferred to the spin chain. The scheme allows us to separate the initialization process from the computation, so that one can optimize the computation part without being restricted by the initialization scheme, which provides us with a wide selection of materials for a quantum computer.
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"abstract": "A method of switching a controlled-NOT gate in a solid-stae NMR quantum\ncomputer is presented. Qubits of I=1/2 nuclear spins are placed periodically\nalong a quantum spin chain (1-D antiferromagnet) having a singlet ground state\nwith a finite spin gap to the lowest excited state caused by some quantum\neffect. Irradiation of a microwave tuned to the spin gap energy excites a\npacket of triplet magnons at a specific part of the chain where control and\ntarget qubits are involved. The packet switches on the Suhl-Nakamura\ninteraction between the qubits, which serves as a controlled NOT gate. The\nqubit initialization is achieved by a qubit initializer consisting of\nsemiconducting sheets attached to the spin chain, where spin polarizations\ncreated by the optical pumping method in the semiconductors are transferred to\nthe spin chain. The scheme allows us to separate the initialization process\nfrom the computation, so that one can optimize the computation part without\nbeing restricted by the initialization scheme, which provides us with a wide\nselection of materials for a quantum computer.",
"arxiv_id": "quant-ph/0205135",
"authors": [
"Atsushi Goto",
"Tadashi Shimizu",
"Kenjiro Hashi",
"Hideaki Kitazawa"
],
"categories": [
"quant-ph",
"cond-mat.str-el"
],
"doi": "10.1103/PhysRevA.67.022312",
"journal_ref": "Physical Review A 67, 022312 (2003).",
"title": "A switchable controlled-NOT gate in a spin-chain NMR quantum computer",
"url": "https://arxiv.org/abs/quant-ph/0205135"
},
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