Cooling a micromechanical resonator to its ground state by measurement and feedback

Predictions for Cooling a Solid to Its Ground State

A major goal of quantum computing research is to drain all quanta (q) of thermal energy from a solid at a positive temperature T0 > 0, leaving the object in its ground state. In 2010 the first complete success was reported when a quantum drum was cooled to its ground state at T0 = 20mK. However, current theory, which is based on the Bose-Einstein equation, predicts that temperature T → 0 as q →...

Feedback cooling of a nanomechanical resonator

Asa Hopkins, Kurt Jacobs, Salman Habib, and Keith Schwab T-8, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, California 91125, USA Laboratory for Physical Sciences, College Park, Maryland 20740, USA ~Received 25 February 2003; revised manuscript received 2 July 2003;...

Ground-state cooling of a carbon nanomechanical resonator by spin-polarized current.

We study the nonequilibrium steady state of a mechanical resonator in the quantum regime realized by a suspended carbon nanotube quantum dot in contact with two ferromagnets. Because of the spin-orbit interaction and/or an external magnetic field gradient, the spin on the dot couples directly to the flexural eigenmodes. Accordingly, the nanomechanical motion induces inelastic spin flips of the ...

Ground state cooling of a nanomechanical resonator via a Cooper pair box qubit

In this paper we present a scheme for ground state cooling of a flexural mode of a nanomechanical beam incorporated in a loop-shaped Cooper-pair box (CPB) circuit. Via the Lorentz force coupling of the beam motion to circulating CPB-circuit currents, energy is transferred to the CPB qubit which acts as a dissipative two-level system. The cooling process is driven by a detuned gate-voltage drive...

Excitation, detection, and passive cooling of a micromechanical cantilever using near-field of a microwave resonator