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Nanomechanical Systems in the Quantum Regime

Pierre-Louis Giscard

Jan 1, 20090 citations

Cooling and squeezing the fluctuations of a nanomechanical beam by indirect quantum feedback control

Jing Zhang, Yu-xi Liu, Franco Nori

We study cooling and squeezing the fluctuations of a nanomechanical beam using quantum feedback control. In our model, the nanomechanical beam is coupled to a transmission line resonator via a superconducting quantum interference device. The leakage of the electromagnetic field from the transmission line resonator is measured using homodyne detection. This measured signal is then used to design a quantum feedback control signal to drive the electromagnetic field in the transmission line resonator. Although the control is imposed on the transmission line resonator, this quantum feedback control signal indirectly affects the thermal motion of the nanomechanical beam via the inductive beam-resonator coupling, making it possible to cool and squeeze the fluctuations of the beam, allowing it to approach the standard quantum limit.We study cooling and squeezing the fluctuations of a nanomechanical beam using quantum feedback control. In our model, the nanomechanical beam is coupled to a transmission line resonator via a superconducting quantum interference device. The leakage of the electromagnetic field from the transmission line resonator is measured using homodyne detection. This measured signal is then used to design a quantum feedback control signal to drive the electromagnetic field in the transmission line resonator. Although the control is imposed on the transmission line resonator, this quantum feedback control signal indirectly affects the thermal motion of the nanomechanical beam via the inductive beam-resonator coupling, making it possible to cool and squeeze the fluctuations of the beam, allowing it to approach the standard quantum limit.

arXiv:0902.2526Physical Review AMay 1, 200974 citations

Coherent Feedback Cooling of a Nanomechanical Membrane with Atomic Spins

Gian-Luca Schmid, Chun Tat Ngai, Maryse Ernzer +3 more

Coherent feedback stabilizes a system toward a target state without the need of a measurement, thus avoiding the quantum backaction inherent to measurements.Here, we employ optical coherent feedback to remotely cool a nanomechanical membrane using atomic spins as a controller.Direct manipulation of the atoms allows us to tune from strong coupling to an overdamped regime.Making use of the full coherent control offered by our system, we perform spin-membrane state swaps combined with stroboscopic spin pumping to cool the membrane in a room-temperature environment to T ¼ 216 mK ( nm ¼ 2.3 × 10 3 phonons) in 200 μs.We furthermore observe and study the effects of delayed feedback on the cooling performance.Starting from a cryogenically precooled membrane, this method would enable cooling of the mechanical oscillator close to its quantum mechanical ground state and the preparation of nonclassical states.Coherent feedback stabilizes a system toward a target state without the need of a measurement, thus avoiding the quantum backaction inherent to measurements.Here, we employ optical coherent feedback to remotely cool a nanomechanical membrane using atomic spins as a controller.Direct manipulation of the atoms allows us to tune from strong coupling to an overdamped regime.Making use of the full coherent control offered by our system, we perform spin-membrane state swaps combined with stroboscopic spin pumping to cool the membrane in a room-temperature environment to T ¼ 216 mK ( nm ¼ 2.3 × 10 3 phonons) in 200 μs.We furthermore observe and study the effects of delayed feedback on the cooling performance.Starting from a cryogenically precooled membrane, this method would enable cooling of the mechanical oscillator close to its quantum mechanical ground state and the preparation of nonclassical states.

arXiv:2111.09802Physical Review XJan 31, 202229 citations

Quantum Nanomechanics

Pritiraj Mohanty

arXiv:0802.4116Understanding complex systemsFeb 9, 20091 citation

Quantum-state Measurement in a Nanomechanical System

Seung‐Bo Shim

Physics and High TechnologyJun 30, 20160 citations

Feedback cooling of a nanomechanical resonator

Asa Hopkins, Kurt A. Jacobs, Salman Habib +1 more

Cooled, low-loss nanomechanical resonators offer the prospect of directly observing the quantum dynamics of mesoscopic systems. However, the present state of the art requires cooling down to the milliKelvin regime in order to observe quantum effects. Here we present an active feedback strategy based on continuous observation of the resonator position for the purpose of obtaining these low temperatures. In addition, we apply this to an experimentally realizable configuration, where the position monitoring is carried out by a single-electron transistor. Our estimates indicate that with current technology this technique is likely to bring the required low temperatures within reach.Cooled, low-loss nanomechanical resonators offer the prospect of directly observing the quantum dynamics of mesoscopic systems. However, the present state of the art requires cooling down to the milliKelvin regime in order to observe quantum effects. Here we present an active feedback strategy based on continuous observation of the resonator position for the purpose of obtaining these low temperatures. In addition, we apply this to an experimentally realizable configuration, where the position monitoring is carried out by a single-electron transistor. Our estimates indicate that with current technology this technique is likely to bring the required low temperatures within reach.

arXiv:cond-mat/0302529Physical review. B, Condensed matterDec 24, 2003174 citations

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