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Quantum superposition, entanglement, and state teleportation of a microorganism on an electromechanical oscillator

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Science Bulletin 2016年第2期61卷 163-171页

作者： tongcang li Zhang-Qi Yin Department of Physics and Astronomy Purdue University School of Electrical and Computer Engineering Purdue University Birck Nanotechnology Center Purdue University Purdue Quantum Center Purdue University Center for Quantum Information Institute of Interdisciplinary Information Sciences Tsinghua University

Schrodinger＇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 straight- forward 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 center- of-mass oscillation of a 15-pro-diameter aluminum mem- brane 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 signifi- cantly 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-of- mass motion and teleported to a remote microorganism. Our proposal can be realized with state-of-the-art tech- nologies. The proposed setup is a quantum-limited mag- netic resonance force microscope. Since internal states of an organism contain information, our proposal also pro- vides a scheme for teleporting information or memories between two remote organisms.

关键词： Quantum superposition Quantumentanglement Quantum teleportation Schrodinger'scat Electromechanical Oscillator Cryopreservedmicroorganism

Nonadiabatic dynamics and geometric phase of an ultrafast rotating electron spin

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Science Bulletin 2019年第6期64卷 380-384页

作者： Xing-Yan Chen tongcang li Zhang-Qi Yin Center for Quantum Information Institute for Interdisciplinary Information Sciences Tsinghua University Max-Planck-Institut für Quantenoptik Fakult?t für Physik Ludwig-Maximilians-Universit?t München Department of Physics and Astronomy Purdue University School of Electrical and Computer Engineering Purdue University Purdue Quantum Center Purdue University Birck Nanotechnology Center Purdue University

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 ***,previous studies only focused on adiabatic limit,where the rotating frequency is much smaller than the spin *** 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 *** find that the transition between the spin levels appears when the rotating frequency is comparable to the spin frequency at zero magnetic *** 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.

关键词： Nitrogen-vacancy center Nonadiabatic geometric phase Ultrafast rotor Rabi oscillation Optomechanics

On-demand assembly of optically levitated nanoparticle arrays in vacuum

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Photonics Research 2023年第4期11卷 600-608页

作者： JIANGWEI YAN XUDONG YU ZHENG VITTO HAN tongcang li JING ZHANG State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Department of Physics and Astronomy Purdue UniversityWest LafayetteIndiana 47907USA

Realizing a large-scale fully controllable quantum system is a challenging task in current physical research and has broad *** this work,we create a reconfigurable optically levitated nanoparticle array in *** optically levitated nanoparticle array allows full control of individual nanoparticles to form an arbitrary pattern and detect their *** a concrete example,we choose two nanoparticles without rotation signals from an array to synthesize a nanodumbbell in situ by merging them into one *** nanodumbbell synthesized in situ can rotate beyond 1 *** work provides a platform for studying macroscopic many-body physics and quantum sensing.

关键词： nanoparticles vacuum nanoparticle

Erratum to: Quantum superposition, entanglement, and state teleportation of a microorganism on an electromechanical oscillator

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Science Bulletin 2016年第3期61卷 264-264页

Erratum to:***.(2016)61(2):163–171DOI 10.1007/s11434-015-0990-x In the initial published version of this article,an error was made in the production *** author,Zhang-Qi Yin,

关键词： entanglement Quantum superposition and state teleportation of a microorganism on an electromechanical oscillator Erratum to