Cooling a micromechanical resonator by quantum back-action from a noisy qubit

Cooper-Pair Molasses - Cooling a Nanomechanical Resonator with Quantum Back-Action

Quantum mechanics demands that measurement must affect the measured object. When continuously monitoring position with a linear amplifier the Heisenberg uncertainty relationship requires that the object be driven by force impulses, called back-action 1,2,3. Here we report the detection of the measurement back-action of a superconducting single-electron transistor (SSET) which measures the posit...

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

Quantum reservoir engineering and single qubit cooling

Stabilizing a quantum system in a desired state has important implications in quantum information science. In control engineering, stabilization is usually achieved by the use of feedback. The closed-loop control paradigm consists of measuring the system in a nondestructive manner, analyzing in real-time the measurement output to estimate the dynamical state and finally, calculating a feedback ...

Quantum heating of a nonlinear resonator probed by a superconducting qubit.

We measure the quantum fluctuations of a pumped nonlinear resonator using a superconducting artificial atom as an in situ probe. The qubit excitation spectrum gives access to the frequency and amount of excitation of the intracavity field fluctuations, from which we infer its effective temperature. These quantities are found to be in agreement with theoretical predictions; in particular, we exp...

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...