Journal
PHYSICAL REVIEW LETTERS
Volume 126, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.193602
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Funding
- ERC Synergy grant HyperQ [856432]
- EU project HYPERDIAMOND [667192]
- EU project AsteriQs [820394]
- QuantERA project NanoSpin [13N14811]
- BMBF project DiaPol [13 GW 0281C]
- state of BadenWurttemberg through bwHPC
- German Research Foundation (DFG) [INST 40/467-1 FUGG]
- Alexander von Humboldt Foundation
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This study presents a ground-state cooling scheme for the mechanical degrees of freedom of mesoscopic magnetic particles levitated in low-frequency traps, using a binary sensor and shaped pulses. By precisely determining the position and momentum of the particle, the method transforms the initial high-entropy thermal state into a pure coherent state, and extracts energy by shifting the trap center. Numerical benchmarks show its suitability for magnetogravitational traps operating at cryogenic temperatures, paving the way for ground-state cooling of micron-scale particles.
We present a ground-state cooling scheme for the mechanical degrees of freedom of mesoscopic magnetic particles levitated in low-frequency traps. Our method makes use of a binary sensor and suitably shaped pulses to perform weak, adaptive measurements on the position of the magnet. This allows us to precisely determine the position and momentum of the particle, transforming the initial high-entropy thermal state into a pure coherent state. The energy is then extracted by shifting the trap center. By delegating the task of energy extraction to a coherent displacement operation, we overcome the limitations associated with cooling schemes that rely on the dissipation of a two-level system coupled to the oscillator. We numerically benchmark our protocol in realistic experimental conditions, including heating rates and imperfect readout fidelities, showing that it is well suited for magnetogravitational traps operating at cryogenic temperatures. Our results pave the way for ground-state cooling of micron-scale particles.
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