Spin-based quantum computing using electrons on liquid helium

Journal Article · Wed Nov 15 04:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.052338· OSTI ID:20974729

Lyon, S A ^[1]

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1. Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544 (United States)

Numerous physical systems have been proposed for constructing quantum computers, but formidable obstacles stand in the way of making even modest systems with a few hundred quantum bits (qubits). Several approaches utilize the spin of an electron as the qubit. Here it is suggested that the spin of electrons floating on the surface of liquid helium will make excellent qubits. These electrons can be electrostatically held and manipulated much like electrons in semiconductor heterostructures, but being in a vacuum the spins on helium suffer much less decoherence. In particular, the spin-orbit interaction is reduced so that moving the qubits with voltages applied to gates has little effect on their coherence. Remaining sources of decoherence are considered, and it is found that coherence times for electron spins on helium can be expected to exceed 100 s. It is shown how to obtain a controlled-NOT operation between two qubits using the magnetic dipole-dipole interaction.

• OSTI ID: 20974729
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 74; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRIC POTENTIAL
ELECTRONS
HELIUM
INFORMATION THEORY
INTERACTIONS
MAGNETIC DIPOLES
QUANTUM COMPUTERS
QUBITS
SEMICONDUCTOR MATERIALS
SIMULATION
SPIN
TEMPERATURE RANGE 0000-0013 K