Quantum computer using a trapped-ion spin molecule and microwave radiation

D. McHugh*, J. Twamley

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)
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We propose a design for a quantum-information processor where qubits are encoded into hyperfine states of ions held in a linear array of individually tailored linear microtraps and sitting in a spatially varying magnetic field. The magnetic field gradient introduces spatially dependent qubit transition frequencies and a type of spin-spin interaction between qubits. Single- and multiqubit manipulation is achieved via resonant microwave pulses as in liquid-NMR quantum computation while the qubit readout and reset is achieved through trapped-ion fluorescence shelving techniques. By adjusting the microtrap configurations we can tailor, in hardware, the qubit resonance frequencies and coupling strengths. We show that the system possesses a sideband transition structure which does not scale with the size of the processor, allowing scalable frequency discrimination between qubits. By using large magnetic field gradients, one can reset individual qubits in the ion chain via frequency selective optical pulses to implement quantum-error correction, thus avoiding the need for many tightly focused laser beams.

Original languageEnglish
Article number012315
Pages (from-to)1-6
Number of pages6
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number1
Publication statusPublished - 1 Jan 2005
Externally publishedYes

Bibliographical note

McHugh, D. and Twamley, J. Physical review A. Atomic, molecular and optical physics, Vol. 71, no. 1, p. 012315-1 - 012315-6, 2005. Copyright (2005) by the American Physical Society. The original article can be found at http://dx.doi.org/10.1103/PhysRevA.71.012315


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