Coherent Feedback Cooling of an Ultracoherent Phononic-Crystal Membrane at Room Temperature

• URL: http://arxiv.org/abs/2605.20902v1
• Date: Wed, 20 May 2026 08:43:38 GMT
• Title: Coherent Feedback Cooling of an Ultracoherent Phononic-Crystal Membrane at Room Temperature
• Abstract summary: We experimentally demonstrate coherent feedback cooling (CFC) using an ultracoherent density phononic crystal membrane.<n>Our results show the potential of CFC for approaching the ground state of high-$Q$ membranes at room temperature.
• Score: 31.458406135473805
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Optomechanical systems provide a versatile platform for precision measurements and investigations of fundamental physics, where bringing macroscopic resonators into the quantum regime is a widely pursued goal. Achieving such quantum behavior of solid-state mechanical resonators at room temperature would greatly broaden their applications by removing the need for cryogenic environments. Reaching this goal requires efficient cooling of mechanical motion, among various laser cooling methods, dynamical backaction cooling (DBC) is widely utilized in experiments but fundamentally limited when operating in the sideband-unresolved regime. Coherent feedback cooling (CFC) can overcome this limitation, while avoiding state collapse and the electronic restrictions inherent to measurement-based feedback. Here, we experimentally demonstrate CFC using an ultracoherent density phononic crystal membrane. By combining CFC with strong DBC in a relatively narrow cavity, we achieve a phonon occupation reduction from $5.5\times10^{6}$ to $166\pm7$, corresponding to a cooling factor of $3.3\times10^{4}$ at room temperature, even with current experimental limitations. Our results show the potential of CFC for approaching the ground state of high-$Q$ membranes at room temperature.

Related papers

• A robust method to reach the motional quantum regime of (anti-)protons in cryogenic multi-Penning traps [0.0]
  Sympathetic laser cooling is a key concept in precision spectroscopy and quantum state control.<n>We show that anharmonicities of the potential wells can prevent maintaining the resonance condition throughout the cooling process.<n>We show that this scheme enables efficient cooling from cryogenic temperatures all the way to the quantum regime of motion.
  arXiv  Detail & Related papers  (2026-02-26T10:06:38Z)
• Squeezing-enhanced dual-channel interference for ground-state cooling of a levitated micromagnet with low quality factor [4.1817331365592345]
  We propose a dual-channel cooling scheme based on squeezing-enhanced quantum interference.<n>We demonstrate that this cooling mechanism reduces the critical $Q_c$ required for ground-state cooling by three orders of magnitude.<n>Our results provide a feasible path toward preparing macroscopic quantum states by actively controlling the cooling dynamics.
  arXiv  Detail & Related papers  (2026-02-07T13:00:35Z)
• Microwave-Induced Cooling in Double Quantum Dots: Achieving Millikelvin Temperatures to Reduce Thermal Noise around Spin Qubits [0.0]
  Spin qubits in gate-defined quantum dots (QDs) are emerging as a leading technology due to their scalability and long coherence times. This paper proposes a novel gate-defined double quantum dot (DQD) cooling system, where the DQDs act as refrigerants to reduce the local phonon environment around computational qubits.
  arXiv  Detail & Related papers  (2024-08-21T22:32:11Z)
• Limits for coherent optical control of quantum emitters in layered materials [49.596352607801784]
  coherent control of a two-level system is among the most essential challenges in modern quantum optics. We use a mechanically isolated quantum emitter in hexagonal boron nitride to explore the individual mechanisms which affect the coherence of an optical transition under resonant drive. New insights on the underlying physical decoherence mechanisms reveals a limit in temperature until which coherent driving of the system is possible.
  arXiv  Detail & Related papers  (2023-12-18T10:37:06Z)
• Optical self-cooling of a membrane oscillator in a cavity optomechanical experiment at room temperature [0.0]
  Thermal noise is a major obstacle to observing quantum behavior in macroscopic systems. We show that further cooling is prevented by the excess classical noise of our laser source.
  arXiv  Detail & Related papers  (2023-05-24T08:56:23Z)
• Phononically shielded photonic-crystal mirror membranes for cavity quantum optomechanics [48.7576911714538]
  We present a highly reflective, sub-wavelength-thick membrane resonator featuring high mechanical quality factor. We construct a Fabry-Perot-type optical cavity, with the membrane forming one terminating mirror. We demonstrate optomechanical sideband cooling to mK-mode temperatures, starting from room temperature.
  arXiv  Detail & Related papers  (2022-12-23T04:53:04Z)
• Sympathetic cooling of a trapped proton mediated by an LC circuit [0.0]
  We demonstrate sympathetic cooling of a single proton using laser-cooled Be+ ions in spatially separated Penning traps. As this technique uses only image-current interactions, it can be easily applied to an experiment with antiprotons.
  arXiv  Detail & Related papers  (2021-08-29T00:48:25Z)
• A low-loss ferrite circulator as a tunable chiral quantum system [108.66477491099887]
  We demonstrate a low-loss waveguide circulator constructed with single-crystalline yttrium iron garnet (YIG) in a 3D cavity. We show the coherent coupling of its chiral internal modes with integrated superconducting niobium cavities. We also probe experimentally the effective non-Hermitian dynamics of this system and its effective non-reciprocal eigenmodes.
  arXiv  Detail & Related papers  (2021-06-21T17:34:02Z)
• A scalable helium gas cooling system for trapped-ion applications [51.715517570634994]
  A modular cooling system is presented for use with multiple ion-trapping experiments simultaneously. The cooling system is expected to deliver a net cooling power of 111 W at 70 K to up to four experiments.
  arXiv  Detail & Related papers  (2021-06-14T16:37:54Z)
• Open-cavity in closed-cycle cryostat as a quantum optics platform [47.50219326456544]
  We present a fiber-based open Fabry-P'erot cavity in a closed-cycle cryostat exhibiting ultra-high mechanical stability. This set of results manifests open-cavity in a closed-cycle cryostat as a versatile and powerful platform for low-temperature cavity QED experiments.
  arXiv  Detail & Related papers  (2021-03-09T18:41:48Z)
• Algorithmic Ground-state Cooling of Weakly-Coupled Oscillators using Quantum Logic [52.77024349608834]
  We introduce a novel algorithmic cooling protocol for transferring phonons from poorly- to efficiently-cooled modes. We demonstrate it experimentally by simultaneously bringing two motional modes of a Be$+$-Ar$13+$ mixed Coulomb crystal close to their zero-point energies. We reach the lowest temperature reported for a highly charged ion, with a residual temperature of only $Tlesssim200mathrmmu K$ in each of the two modes.
  arXiv  Detail & Related papers  (2021-02-24T17:46:15Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.