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Bulletin of the American Physical Society

Towards Hybrid Quantum Information Processing with Electrons on Helium

A. Fragner, David Schuster, M. I. Dykman, S. A. Lyon, Luigi Frunzio, Robert J. Schoelkopf

Published Feb 27, 2012• 0 citations
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POSSIBILITIES FOR QUANTUM INFORMATION PROCESSING

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We propose a hybrid architecture in which an on-chip high finesse superconducting cavity is coupled to the lateral motion and spin state of a single electron trapped on the surface of superfluid helium. We estimate the motional coherence times to exceed 15 μs, while energy will be coherently exchanged with the cavity photons in less than 10 ns for charge states and faster than 1 μs for spin states, making the system attractive for quantum information processing and strong coupling cavity quantum electrodynamics experiments. The cavity is used for nondestructive readout and as a quantum bus mediating interactions between distant electrons or an electron and a superconducting qubit.
Electrons floating on the surface of liquid helium are possible qubits for quantum information processing. Varying electric potentials do not modify spin states, which allows their transport on helium using a charge-coupled device (CCD)-like array of underlying gates. This scheme depends on an efficient intergate electron transfer and on the absence of electron traps. We will present a measurement of the charge transfer efficiency (CTE) of electrons clocked back and forth above a short CCD-like structure. The CTE obtained at low clocking frequencies is 0.999 with an electron density of about 4electrons∕μm2. We find no evidence for deep electron trapping.