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Spin-cooling of the motion of a trapped diamond 期刊论文
NATURE, 2020
作者:  Auer, Thomas O.;  Khallaf, Mohammed A.;  Silbering, Ana F.;  Zappia, Giovanna;  Ellis, Kaitlyn;  Alvarez-Ocana, Raquel;  Arguello, J. Roman;  Hansson, Bill S.;  Jefferis, Gregory S. X. E.;  Caron, Sophie J. C.;  Knaden, Markus;  Benton, Richard
收藏  |  浏览/下载:37/0  |  提交时间:2020/07/03

Coupling the spins of many nitrogen-vacancy centres in a trapped diamond to its orientation produces a spin-dependent torque and spin-cooling of the motion of the diamond.


Observing and controlling macroscopic quantum systems has long been a driving force in quantum physics research. In particular, strong coupling between individual quantum systems and mechanical oscillators is being actively studied(1-3). Whereas both read-out of mechanical motion using coherent control of spin systems(4-9) and single-spin read-out using pristine oscillators have been demonstrated(10,11), temperature control of the motion of a macroscopic object using long-lived electronic spins has not been reported. Here we observe a spin-dependent torque and spin-cooling of the motion of a trapped microdiamond. Using a combination of microwave and laser excitation enables the spins of nitrogen-vacancy centres to act on the diamond orientation and to cool the diamond libration via a dynamical back-action. Furthermore, by driving the system in the nonlinear regime, we demonstrate bistability and self-sustained coherent oscillations stimulated by spin-mechanical coupling, which offers the prospect of spin-driven generation of non-classical states of motion. Such a levitating diamond-held in position by electric field gradients under vacuum-can operate as a '  compass'  with controlled dissipation and has potential use in high-precision torque sensing(12-14), emulation of the spin-boson problem(15) and probing of quantum phase transitions(16). In the single-spin limit(17) and using ultrapure nanoscale diamonds, it could allow quantum non-demolition read-out of the spin of nitrogen-vacancy centres at ambient conditions, deterministic entanglement between distant individual spins(18) and matter-wave interferometry(16,19,20).


  
Confronting the nitrogen challenge: Options for governance and target setting 期刊论文
GLOBAL ENVIRONMENTAL CHANGE-HUMAN AND POLICY DIMENSIONS, 2019, 54: 40-49
作者:  Morseletto, Piero
收藏  |  浏览/下载:13/0  |  提交时间:2019/04/09
Targets  Excessive anthropogenic nitrogen  Governing by targets  Nitrogen governance  Nitrogen regime  Evaluation of governance options  
Global environmental change effects on plant community composition trajectories depend upon management legacies 期刊论文
GLOBAL CHANGE BIOLOGY, 2018, 24 (4) : 1722-1740
作者:  Perring, Michael P.;  Bernhardt-Roemermann, Markus;  Baeten, Lander;  Midolo, Gabriele;  Blondeel, Haben;  Depauw, Leen;  Landuyt, Dries;  Maes, Sybryn L.;  De Lombaerde, Emiel;  Caron, Maria Mercedes;  Vellend, Mark;  Brunet, Joerg;  Chudomelova, Marketa;  Decocq, Guillaume;  Diekmann, Martin;  Dirnboeck, Thomas;  Doerfler, Inken;  Durak, Tomasz;  De Frenne, Pieter;  Gilliam, Frank S.;  Hedl, Radim;  Heinken, Thilo;  Hommel, Patrick;  Jaroszewicz, Bogdan;  Kirby, Keith J.;  Kopecky, Martin;  Lenoir, Jonathan;  Li, Daijiang;  Malis, Frantisek;  Mitchell, Fraser J. G.;  Naaf, Tobias;  Newman, Miles;  Petrik, Petr;  Reczynska, Kamila;  Schmidt, Wolfgang;  Standovar, Tibor;  Swierkosz, Krzysztof;  Van Calster, Hans;  Vild, Ondrej;  Wagner, Eva Rosa;  Wulf, Monika;  Verheyen, Kris
收藏  |  浏览/下载:40/0  |  提交时间:2019/04/09
biodiversity change  climate change  disturbance regime  forestREplot  herbaceous layer  management intensity  nitrogen deposition  plant functional traits  time lag  vegetation resurvey