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| 1 | Quantum superposition, entanglement, and state teleportation of a microorganism on an electromechanical oscillator显示文摘Schrdinger's thought experiment to prepare a cat in a superposition of both alive and dead states reveals profound consequences of quantum mechanics and has attracted enormous interests. Here we propose a straightforward method to create quantum superposition states of a living microorganism by putting a small cryopreserved bacterium on top of an electromechanical oscillator. Our proposal is based on recent developments that the centerof-mass oscillation of a 15-lm-diameter aluminum membrane has been cooled to its quantum ground state(Teufel et al. in Nature 475:359, 2011), and entangled with a microwave field(Palomaki et al. in Science 342:710,2013). A microorganism with a mass much smaller than the mass of the electromechanical membrane will not significantly affect the quality factor of the membrane and can be cooled to the quantum ground state together with themembrane. Quantum superposition and teleportation of its center-of-mass motion state can be realized with the help of superconducting microwave circuits. More importantly, the internal states of a microorganism, such as the electron spin of a glycine radical, can be entangled with its center-ofmass motion and teleported to a remote microorganism.Our proposal can be realized with state-of-the-art technologies. The proposed setup is a quantum-limited magnetic resonance force microscope. Since internal states of an organism contain information, our proposal also provides a scheme for teleporting information or memories between two remote organisms. | Tongcang Li Zhang-Qi Yin | 2016 | Science Bulletin2016，61，2： | 15 |
| 2 | Hybrid opto-mechanical systems with nitrogen-vacancy centers显示文摘In this review, we briefly review recent works on hybrid(nano) opto-mechanical systems that contain both mechanical oscillators and diamond nitrogen-vacancy(NV) centers. We also review two different types of mechanical oscillators. The first one is a clamped mechanical oscillator, such as a cantilever, with a fixed frequency. The second one is an optically trapped nano-diamond with a built-in nitrogen-vacancy center. By coupling mechanical resonators with electron spins, we can use the spins to control the motion of mechanical oscillators. For the first setup, we discuss two different coupling mechanisms, which are magnetic coupling and strain induced coupling. We summarize their applications such as cooling the mechanical oscillator, generating entanglements between NV centers, squeezing spin ensembles etc. For the second setup, we discuss how to generate quantum superposition states with magnetic coupling, and realize matter wave interferometer. We will also review its applications as ultra-sensitive mass spectrometer. Finally, we discuss new coupling mechanisms and applications of the field. | YIN ZhangQi ZHAO Nan LI TongCang | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，5： | 4 |
| 3 | Nonadiabatic dynamics and geometric phase of an ultrafast rotating electron spin显示文摘The spin in a rotating frame has attracted a lot of attentions recently,as it deeply relates to both fundamental physics such as pseudo-magnetic field and geometric phase,and applications such as gyroscopic sensors.However,previous studies only focused on adiabatic limit,where the rotating frequency is much smaller than the spin frequency.Here we propose to use a levitated nano-diamond with a built-in nitrogen-vacancy(NV)center to study the dynamics and the geometric phase of a rotating electron spin without adiabatic approximation.We find that the transition between the spin levels appears when the rotating frequency is comparable to the spin frequency at zero magnetic field.Then we use Floquet theory to numerically solve the spin energy spectrum,study the spin dynamics and calculate the geometric phase under a finite magnetic field,where the rotating frequency to induce resonant transition could be greatly reduced. | Xing-Yan Chen Tongcang Li Zhang-Qi Yin | 2019 | Science Bulletin2019，64，6： | 2 |
| 4 | On-demand assembly of optically levitated nanoparticle arrays in vacuum显示文摘Realizing a large-scale fully controllable quantum system is a challenging task in current physical research and has broad applications.In this work,we create a reconfigurable optically levitated nanoparticle array in vacuum.Our optically levitated nanoparticle array allows full control of individual nanoparticles to form an arbitrary pattern and detect their motion.As a concrete example,we choose two nanoparticles without rotation signals from an array to synthesize a nanodumbbell in situ by merging them into one trap.The nanodumbbell synthesized in situ can rotate beyond 1 GHz.Our work provides a platform for studying macroscopic many-body physics and quantum sensing. | JIANGWEI YAN XUDONG YU ZHENG VITTO HAN TONGCANG LI JING ZHANG | 2023 | Photonics Research2023，11，4： | 0 |
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