Science v. 284, 18 Jun 99 p1967-69 _Quantum computing with electrons floating on liquid helium._ Jist: thousands of qubits possible, wave function changes in nsec, coheres for msec. Machinery: very cold helium layer on top of patterned electrodes. Electrons are stored on other (exposed) surface of the He, location trapped by electrodes. Voltages on electrodes alter resonances; Write with microwave pulses. Read by reversing voltage on He layer, waiting, and amplifying electrons released from some electrode sites. Whole thing in vacuum. Well-established physics behind it. PM Platzman, MI Dykman Bell Labs/Lucent, Michigan State Physics & Astronomy
