Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session C27: Optomechanics III |
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Sponsoring Units: DAMOP DQI Chair: John Teufel, NIST Room: LACC 404B |
Monday, March 5, 2018 2:30PM - 2:42PM |
C27.00001: Thermal management and non-reciprocal control of phonon flow via optomechanics Alireza Seif, Wade DeGottardi, Keivan Esfarjani, Mohammad Hafezi Engineering phonon transport in physical systems is a subject of interest in the study of materials and plays a crucial role in controlling energy and heat transfer. Of particular interest are non- reciprocal phononic systems, which in direct analogy to electric diodes, provide a directional flow of energy. Here, we propose an engineered nanostructured material, in which tunable non-reciprocal phonon transport is achieved through optomechanical coupling. Our scheme relies on breaking time-reversal symmetry by a spatially varying laser drive, which manipulates low-energy acoustic phonons. Furthermore, we take advantage of recent developments in the manipulation of high- energy phonons through controlled scattering mechanisms, such as using alloys and introducing disorder. These combined approaches allow us to design an acoustic isolator and a thermal diode. Our proposed device will have potential impact in phonon-based information processing, and heat management in low temperatures. |
Monday, March 5, 2018 2:42PM - 2:54PM |
C27.00002: Tomography of an Optomechanical Oscillator Prahlad Warszawski, Warwick Bowen, Alex Szorkovsky, Andrew Doherty Optomechanical systems provide an attractive testbed for the creation and manipulation of nonclassical states of mechanical motion. A key experimental challenge is demonstrating that the desired quantum state has actually been prepared. We propose a new, realistic, experimental protocol for quantum state tomography of nonclassical states in optomechanical systems. Using a parametric drive, the procedure overcomes the challenges of weak optomechanical coupling and thermal noise to provide high efficiency homodyne measurement. Our analysis is based on the theoretical description of the generalised measurement that is performed when optomechanical position measurement competes with thermal noise and the parametric drive. The proposed experimental procedure is numerically simulated in realistic parameter regimes, which allows us to show that tomographic reconstruction of otherwise unverifiable nonclassical states is made possible. |
Monday, March 5, 2018 2:54PM - 3:06PM |
C27.00003: Optical Forces in Nanostructured Material Kevin Webb, Yu-Chun Hsueh, Li-Fan Yang, Anurup Datta, Xianfan Xu Nanostructured material is presented as a means to control the force on a solid-state material. We describe results for resonant cavities in metal and for other surface waveguides that are excited with an array of slots that can both enhance the pressure and control the direction of the force. More generally, we relate nanostructured material to optical force for aperiodic binary structures, where a region of space is decomposed into a grid and some voxels have material and others do not. The work is an extension of our recent description of field control and statistics with such structures. This theoretical and simulation effort interfaces with an experimental program and emphasizes fundamental understanding related to forces on structured material. Use of both the incident wave properties and the structure and composition of a material provides fertile dimensions to control the optical force that can be imparted. This work could impact applications such as all-optical communications, where routing is achieved by optomechanical control, cavity cooling, tweezing where structured beads are used, and other fields where remote actuation is important. |
Monday, March 5, 2018 3:06PM - 3:18PM |
C27.00004: Anderson localization in optomechanical arrays Thales Figueiredo Roque, Oleg Yevtushenko, Florian Marquardt Optomechanical arrays (OMA) are a promising future platform for studies of transport, many-body dynamics, quantum control and topological effects in systems of coupled photonic and phononic modes. Even a weak dispersion of parameters of individual optomechanical cells makes OMA strongly disordered. We study such disordered OMA driven by an external laser, focusing on features of Anderson- and many-body localization. Driven OMA represent a unique disordered system, where key parameters can be easily controlled by varying the frequency and the amplitude of the external laser field. Such a high level of control allows one to explore a number of nontrivial aspects of localization, including generic properties of localization in non-equilibrium dissipative systems, localization of hybrid photon-phonon excitations, the interplay of localization with strong optomechanical nonlinearities, to name just a few. |
Monday, March 5, 2018 3:18PM - 3:30PM |
C27.00005: Cavity optomagnonics with a magnetic vortex Silvia Viola Kusminskiy, Florian Marquardt, Jasmin Graf In optomagnonics, light couples coherently to collective magnetic excitations in solid state systems. This topic is of high interest for quantum information processing platforms at the nanoscale. A unique feature of these systems is the possibility of coupling light to spin excitations on top of magnetic textures. A classical example of a texture is a magnetic vortex, which is the stable equilibrium configuration in thin micromagnetic disks. In this work, we study the optomagnonic coupling between magnon modes in the presence of a vortex, and light confined to whispering gallery modes in the disk geometry. |
Monday, March 5, 2018 3:30PM - 3:42PM |
C27.00006: Adiabatic transfer of energy fluctuations between membranes inside an optical cavity Devender Garg, Anil Chauhan, Asoka Biswas A scheme is presented for the coherent and deterministic transfer of average fluctuations in the phonon number between two membranes in an optical cavity. We show that by driving the cavity modes with external time-delayed pulses, one can obtain an effect analogous to stimulated Raman adiabatic passage in the atomic systems. The adiabatic transfer of fluctuations from one membrane to the other is attained through a ‘dark’ mode, that is robust against decay of the mediating cavity mode. The results are supported with analytical and numerical calculations with experimentally feasible parameters. This clearly opens up an avenue of quantum communication between two truly mesoscopic systems. |
Monday, March 5, 2018 3:42PM - 3:54PM |
C27.00007: Radiative Corrections to Quantum Sticking for Cold Atoms on Suspended Graphene Sanghita Sengupta, Dennis Clougherty We study the adsorption rate of atomic hydrogen to suspended graphene using three different methods that include contributions from processes with multiple soft-phonon emissions. We compare the numerical results of the adsorption rate obtained by: (1) the loop expansion of the atom self-energy, (2) the non-crossing approximation (NCA) and (3) the independent boson model approximation (IBMA). The loop expansion reveals an infrared problem, analogous to the infamous infrared problem in QED. The 2-loop contribution to the sticking rate gives a result that tends to diverge for large membranes. The latter two methods remedy this infrared problem and give results that are finite in the limit of an infinite membrane. We find that for micromembranes, the methods of NCA and IBMA give results that are in good agreement with each other. Lastly, we provide detailed results for the effect of finite temperature on the adsorption rate of cold atoms. [1] S.Sengupta and D.P. Clougherty, Phys Rev B.96.035419 |
Monday, March 5, 2018 3:54PM - 4:06PM |
C27.00008: Multimode opto-electro-mechanical transducer for high sensitive optical readout of electrical signals David Vitali, Nicola Malossi, Giovanni Di Giuseppe, Riccardo Natali, Iman Moaddel Haghighi An opto-electro-mechanical system formed by a nanomembrane capacitively coupled to an LC resonator and to an optical interferometer has been recently demonstrated for the high-sensitive optical readout of rf signals. We propose and experimentally demonstrate how the performance of such kind of transducer can be improved by controlling the interference between two electromechanical interaction pathways of a two-mode mechanical system. With a proof-of-principle device based operating at room temperature, we achieve a sensitivity of 10 nV/$\sqrt{{\rm Hz}}$ over a bandwidth of 5 kHz and a broader band sensitivity of 300 nV/$\sqrt{{\rm Hz}}$ over a bandwidth of 15 kHz. We discuss strategies for improving the performance of the device, showing that a mechanical multi-mode transducer can achieve a bandwidth larger than that of a single-mode one for the same given sensitivity. We derive a simple general relation between the bandwidth and the ultimate sensitivity of this class of transducers. We also underline that the interference at the basis of the increased bandwidth is the same allowing for a nonreciprocal feature of the device. |
Monday, March 5, 2018 4:06PM - 4:18PM |
C27.00009: Enhanced Nonlinear Interaction Effects in a Four-mode Cavity Optomechanical Ring LIJING JIN, Ying-Dan Wang, Stefano Chesi With a perturbative treatment based on the Keldysh Green's function technique, we study the resonant enhancement of nonlinear interaction effects in a 4-mode optomechanical ring. In such a system, we identify five distinct types of resonant scattering between non-perturbed polariton modes, induced by the nonlinear optomechanical interaction. By computing the cavity density of states and optomechanical induced transparency (OMIT) signal, we find that the largest nonlinear effects are induced by a decay process involving the two phonon-like polaritons. In contrast to the conventional two-mode optomechanical system, our proposed system can exhibit prominent nonlinear features even in the regime when the the single-photon coupling is much smaller than the cavity damping. |
Monday, March 5, 2018 4:18PM - 4:30PM |
C27.00010: Deterministic Preparation of Arbitrary Single-Excitation Quantum State by a Shaped Single-Photon Pulse Zeyang Liao, M.Suhail Zubairy Preparation of arbitrary quantum state such as highly entangled state has important applications in quantum information and quantum metrology. Here, we propose a method to prepare arbitrary single-excitation quantum state in a one-dimensional (1D) waveguide-QED system by photon pulse shaping. We show that the maximum entangled states such as arbitrary single-excitation Dicke and timed-Dicke states can be successfully prepared with almost unit fidelity. |
Monday, March 5, 2018 4:30PM - 4:42PM |
C27.00011: Extracting single electron wavefunctions from a quantum electrical current Arthur Marguerite, Benjamin Roussel, Rémi Bisognin, Clément Cabart, Manohar Kumar, Jean-Marc Berroir, Erwan Bocquillon, Bernard Plaçais, Antonella Cavanna, Ulf Gennser, Yong Jin, Pascal Degiovanni, Gwendal Fève Quantum nanoelectronics has entered an era where quantum electrical currents are built from single to few on-demand elementary excitations [Annalen der Physik, 526, 1 (2014)]. |
Monday, March 5, 2018 4:42PM - 4:54PM |
C27.00012: Quantum Behaviour in Systems with a Mechanical Element João Machado, Yaroslav Blanter Reaching the quantum regime in systems featuring macroscopic mechanical resonators is a current challenge that precedes the use of such systems to test fundamental physics. Mechanical resonators can be coupled to a wide range of systems such as LC-circuits, light inside an optical cavity, superconducting Josephson junctions, other mechanical resonators, spins in diamonds, and others. Such diverse possibilities provide an enormous set of distinct forms of interactions, and consequently physical phenomena. |
Monday, March 5, 2018 4:54PM - 5:06PM |
C27.00013: Cavity-free quantum optomechanical cooling by atom-modulated radiation Hoi-Kwan Lau, Alexander Eisfeld, Jan Rost We theoretically study how the mechanical motion of an oscillating mirror reacts to electromagnetic radiation which is modulated by remotely trapped Λ-level atoms. When illuminated by continuous-wave radiation, the mirror motion will induce red and blue sideband radiation fields that respectively increases and reduces phonon excitation. We find that by suitably driving the atoms, specific frequencies of radiation could be effectively reflected back to the mirror by a four-wave mixing process. Such process allows us to manipulate the heating and cooling effects of the mirror. Particularly, if the red sideband fields accumulates a π phase during the round-trip, the heating effects can be eliminated, thus the mirror could be cooled to the ground motional state. Without the necessity of cavity installation and perfect alignment, our proposal complements other efforts in quantum cooling of macroscopic objects. |
Monday, March 5, 2018 5:06PM - 5:18PM |
C27.00014: Enhancing a Slow and Weak Optomechanical Nonlinearity with Delayed Quantum Feedback Zhaoyou Wang, Amir Safavi-Naeini A central goal of quantum optics is to generate large interactions between single photons so that one photon can strongly modify the state of another one. In cavity optomechanics, photons interact with the motional degrees of freedom of an optical resonator, for example, by imparting radiation pressure forces on a movable mirror or sensing minute fluctuations in the position of the mirror. Here, we show that the optical nonlinearity arising from these effects, typically too small to operate on single photons, can be sufficiently enhanced with feedback to generate large interactions between single photons. We propose a protocol that allows photons propagating in a waveguide to interact with each other through multiple bounces off an optomechanical system. The protocol is analysed by evolving the full many-body quantum state of the waveguide-coupled system, illustrating that large photon–photon interactions mediated by mechanical motion may be within experimental reach. |
Monday, March 5, 2018 5:18PM - 5:30PM |
C27.00015: Parametric Amplification in MoS2 Drum Resonator and Effects of Nonlinearity Parmeshwar PRASAD, Nishta Arora, A K Naik Parametric amplification is widely used in diverse areas from optics to electronic circuits to enhance low level signals by varying relevant system parameters. Parametric amplification has also been performed on several micro-nano resonators including nano-electromechanical system (NEMS) resonators based on two-dimensional (2D) material. Here, we study the enhancement of mechanical response in MoS2 drum resonator using degenerate parametric amplification. We use parametric pumping to modulate the stiffness of MoS2 resonator and enhance the mechanical response. We also investigate the effect of Duffing nonlinearity on parametric amplification and demonstrate it limits the gain of the mechanical resonator. At present, we are working to tune the nonlinearities to maximize the gain. Enhancing the mechanical response and understanding the limitations of the amplification in these devices is key to using these devices for practical applications. |
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