Bulletin of the American Physical Society
49th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
Volume 63, Number 5
Monday–Friday, May 28–June 1 2018; Ft. Lauderdale, Florida
Session C04: Hybrid Quantum Systems |
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Chair: Wenchao Ge, US Army Research Lab Room: Grand C |
Tuesday, May 29, 2018 10:30AM - 10:42AM |
C04.00001: Designing Superconducting Mm-wave Photonic Crystal Cavities for Rydberg Cavity Quantum Electrodynamics Aziza Suleymanzade, Mark Stone, Joshua Wakefield, Lin Su, Jasmine Kalia, David Schuster, Jonathan Simon I will describe progress towards a hybrid experimental system for engineering strong interactions between single optical and mm-wave photons using Rydberg atoms as an interface. Entanglement between photons with 100 gigahertz and optical frequencies creates a new platform to access exotic photonic quantum states as well as powerful new techniques in quantum computing and simulation at 1K. I will present recent experimental developments including trapping and cooling atoms in a cryogenic Magneto Optical Trap, measuring high-Q superconducting cavities at 100 GHz and coupling atoms to an optical cavity inside our custom designed and home-made cryostat. I will discuss in detail our use of photonic crystals as a new design for fabricated 100-gigahertz superconducting resonators. [Preview Abstract] |
Tuesday, May 29, 2018 10:42AM - 10:54AM |
C04.00002: Slow spin dynamics in a 2D dipolar spin ensemble on the surface of diamond Alexander Sushkov, Kristine Rezai, Soonwon Choi, Phillip Weinberg, Emma Rosenfeld, Mikhail Lukin We observe remarkably slow local spin dynamics in a two-dimensional disordered many-body dipolar spin system, formed by naturally-occurring electronic spins on the surface of a diamond crystal. Shallow NV centers are used to access individual spins, or small spin sub-ensembles. Effective disorder and spin-spin interactions can be controlled by driving the spin system. Local spin diffusion is suppressed by up to a factor of 100, compared to the timescale given by the spin-spin interactions. This slow-down of spin relaxation can dramatically improve the sensitivity of nanoscale-resolution field sensing. [Preview Abstract] |
Tuesday, May 29, 2018 10:54AM - 11:06AM |
C04.00003: Amplification of Vacuum Fluctuations in the Deep Strong Coupling Regime Belter E Ordaz Mendoza, Susanne F Yelin Optomechanics in the deep strong coupling regime is when the mechanical displacement produced by a single photon is more that its zero-point fluctuation. Recently, theoretical works have elucidated that the deep strong coupling regime could be achieved in quantum systems. In this work, we study amplification of vacuum fluctuations in the deep strong coupling regime, where the single-photon coupling rate is on the same order of magnitude of the lowest cavity frequency. Our model consists of a cavity field with one mirror fixed and the other movable in the presence of cavity loss and mechanical damping. Our model requires the cavity decay rate to be smaller than the cavity frequency, such that a single photon present in the cavity can be long enough to influence the dynamics of the mechanical oscillator. By starting with no photons and phonons, the mirror's motion follows from vacuum fluctuations. We calculate the time evolution of the average number of photons and phonons using the Heisenberg-Langevin approach, and find that amplification of vacuum fluctuation of both degrees of freedom occur when the model operates in the deep strong coupling regime. [Preview Abstract] |
Tuesday, May 29, 2018 11:06AM - 11:18AM |
C04.00004: Abstract Withdrawn
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Tuesday, May 29, 2018 11:18AM - 11:30AM |
C04.00005: Optically levitated nanoparticle phonon laser M. Bhattacharya, R. Pettit, W. Ge, P. Kumar, A.N. Vamivakas We theoretically propose and experimentally realize a phonon laser using an optically levitated nanoparticle. In our system, mechanical gain and nonlinearity are supplied optically. We present theoretical evidence for stimulated emission of phonons, and experimental observations of i) threshold behavior as a function of gain, ii) the transition in phonon statistics from Boltzmann to Poisson across the threshold, and iii) subthermal phonon number squeezing far above threshold. Our data agrees well with a microscopic quantum mechanical theory. Our work represents a substantial advance in the generation of coherent phonons in levitated systems and can be readily extended to other physical platforms. [Preview Abstract] |
Tuesday, May 29, 2018 11:30AM - 11:42AM |
C04.00006: Trapped ion vibrational lasing from resonant illumination with a mode locked laser Conrad Roman, Anthony Ransford, Michael Ip, Xueping Long, Andrew Jayich, Wesley C. Campbell Atomic transitions can resolve the structure of a resonant optical frequency comb if the excited state lifetime is significantly longer than the pulse repetition period. In the intermediate regime where the atomic state lifetime and pulse repetition period are comparable, we demonstrate Doppler cooling of a trapped Yb ion by a single tooth of a frequency-doubled optical frequency comb. These broadband pulses with high instantaneous intensities can be readily frequency-doubled to the ultraviolet with enough power to allow loading and Doppler cooling of atomic ion crystals without the need for a CW Doppler cooling laser. We additionally find that a multi-tooth effect gives rise to lasing of the ion’s harmonic motion in the trap, verified by acoustic injection locking. The gain saturation of this phonon laser action leads to a comb of steady-state oscillation amplitudes, permitting continued confinement despite the presence of hundreds of blue-detuned teeth. [Preview Abstract] |
Tuesday, May 29, 2018 11:42AM - 11:54AM |
C04.00007: Magnetometry via spin-mechanical coupling in levitated optomechanics Pardeep Kumar, Mishkat Bhattacharya Recently hybrid levitated optomechanics have been realized using a nanodiamond containing a single nitrogen vacancy (NV) center. In such nanomechanical systems the mechanical oscillation of levitated diamond couples to its spin degree of freedom by means of magnetic field gradient thereby providing a versatile platform for sensing applications. Here, we propose magnetometry based on an NV-center optically levitated in an ultrahigh vacuum and subjected to feedback cooling. In particular, we describe magnetic field gradient sensitivity in two ways (i) by analyzing the position spectrum of the mechanical oscillator (ii) by maneuvering spin degree of freedom. The first scheme offers a magnetic field gradient sensitivity of 1 $\mu$Tm$^{-1}$/$\sqrt{\mbox{Hz}}$ under the conditions of ultrahigh vacuum and feedback cooling. However, working at high pressure and room temperature degrades the sensitivity to a value of 100 $m$Tm$^{-1}$/$\sqrt{\mbox{Hz}}$. Further, we use Ramsey interferometry to manipulate the spin degree of freedom and obtain photon-shot noise and spin-projection noise limited magnetic field gradient sensitivity of 100 $\mu$Tm$^{-1}$/$\sqrt{\mbox{Hz}}$. Thus, the proposed nanomagnetometer provides a promising platform for ultrasensitive applications. [Preview Abstract] |
Tuesday, May 29, 2018 11:54AM - 12:06PM |
C04.00008: ABSTRACT WITHDRAWN Abstract withdrawn. [Preview Abstract] |
Tuesday, May 29, 2018 12:06PM - 12:18PM |
C04.00009: Proposal for observing noise-induced coherent dynamics in NV centers Suyesh Koyu, Timur Tscherbul We explore the possibility for the experimental observation of noise-induced Fano coherences in nitrogen-vacancy (NV) centers in diamond. The ground electronic state of the NV center is proposed as a three-level V-system, which exhibits coherent dynamics when driven by incoherent microwave radiation [1-3]. We show how both the oscillatory (overdamped) and long-lived (underdamped) regimes of coherent dynamics [2,3] can be realized experimentally by varying the excited state splitting of the $m_s = \pm 1$ energy levels with an external magnetic field. [1] T. V. Tscherbul and P. Brumer, Phys. Rev. Lett. 113, 113601 (2014). [2] A. Dodin, T. V. Tscherbul, and P. Brumer, J. Chem. Phys. 144, 244108 (2016). [3] S. Koyu and T. V. Tscherbul, arXiv:1712.04625 (2017). [Preview Abstract] |
Tuesday, May 29, 2018 12:18PM - 12:30PM |
C04.00010: Collective coherent and dissipative dynamics of two quantum emitters in a nanophotonic cavity. Denis Sukachev, Mihir Bhaskar, Ruffin Evans, Mike Burek, Christian Nguyen, Alp Sipahigil, Bartholomeus Machielse, Ed Bielejec, Marco Loncar, Misha Lukin Interactions between two quantum emitters are a key ingredient for quantum networks. We demonstrate photon-mediated interactions in a platform consisting of two negatively-charged silicon-vacancy (SiV) color centers in diamond coupled with high cooperativity (C$\sim$20) to a nanophotonic cavity. We access cavity-coupled spin-selective optical transitions to initialize and read the SiV spin in a single shot with 96{\%} fidelity. When the optical transitions of the two SiV centers are near-resonant, the coupling of each SiV center to the cavity mode results in a cavity-mediated interaction between the two SiVs. This interaction hybridizes the two-SiV states into collective bright and dark states. Tuning of the magnetic field allows us to control the strength of this effect and observe a direct optical interaction between two SiV spin states. Thus, SiV centers which also have a long spin coherence of 10 ms may form building blocks for future quantum networks. [Preview Abstract] |
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