Quantum Computing with Electrons Floating on Liquid Helium

Electrons on a helium surface form a quasi two-dimensional system which displays the highest mobility reached ini condensed matter physics. We propose to use this system as a set of interacting quantum bits. We sill briefly describe the system and discuss how the qubits can be addressed and manipulated. The working frequency of the proposed quantum computer is ~1 Ghz. Careful analysis shows that the relaxation rate can be at least 5 orders of magnitude smaller, for low temperatures.