Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session K24: Hybrid/Macroscopic Quantum Systems, Optomechanics, and Interfacing AMO with Solid State/Nano Systems IIFocus
|
Hide Abstracts |
Sponsoring Units: DAMOP DQI Chair: David Schuster, University of Chicago Room: BCEC 159 |
Wednesday, March 6, 2019 8:00AM - 8:12AM |
K24.00001: Entanglement of Two Remote Mechanical Resonators Ralf Riedinger, Andreas Wallucks, Igor Marinković, Sungkun Hong, Markus Aspelmeyer, Simon Groeblacher Entanglement is a key feature of quantum mechanics and plays an important role in many quantum information processing protocols. Here we report on the entanglement of two massive mechanical oscillators located on separate chips. Intriguingly, the silicon photonics devices employed in this experiment can serve as long-lived quantum memories and are directly interfaced to photons in the telecom wavelength range around 1550nm. We further report on the observation of entanglement between a flying telecom photon and a pair of such quantum memories. |
Wednesday, March 6, 2019 8:12AM - 8:24AM |
K24.00002: Optical Backaction-Evading Measurement of a Mechanical Oscillator Itay Shomroni, Liu Qiu, Daniel Malz, Andreas Nunnenkamp, Tobias Kippenberg Quantum mechanics imposes a limit on the precision of a continuous position measurement of a harmonic oscillator, as a result of quantum backaction arising from quantum fluctuations in the measurement field. A variety of techniques to surpass this standard quantum limit have been proposed, such as variational measurements, stroboscopic quantum non-demolition and two-tone backaction-evading (BAE) measurements. The latter proceed by monitoring only one of the two non-commuting quadratures of the motion. This technique, originally proposed in the context of gravitational wave detection, has not been implemented using optical interferometers to date. Here we demonstrate continuous two-tone BAE measurement in the optical domain of a localized GHz frequency mechanical mode of a photonic crystal nanobeam cryogenically and optomechanically cooled close to the ground state, employing quantum-limited detection. We observe up to 0.67dB (14%) reduction of total measurement noise, thereby demonstrating the viability of BAE measurements for optical ultrasensitive measurements of motion and force in nanomechanical resonators. |
Wednesday, March 6, 2019 8:24AM - 8:36AM |
K24.00003: Cavity cooling of levitated nanospheres by coherent scattering Uros Delic, Manuel Reisenbauer, David Grass, Nikolai Kiesel, Markus Aspelmeyer Although cavity cooling of levitated nanospheres has been demonstrated in recent years, regime of strong optomechanical cooperativity C>1 is yet to be reached, leading to full quantum control of nanosphere motion. A common obstacle in many experiments is stable levitation of nanospheres in ultra-high vacuum (UHV). However, stable trapping has been achieved in an optical dipole trap in several experiments through the use of three-dimensional parametric feedback. We exploit this by combining such a trap with an optical cavity and demonstrate cavity optomechanics with a silica nanosphere in UHV. We confirm the trapping of nanospheres of nominal radius through a novel method using the variable coupling to a cavity mode. We achieve C=0.02, showing a five orders of magnitude improvement of cooperativity from our previous work. We then modify this setup to drive the cavity mode solely by scattered photons from tweezer laser. In addition, cavity enhanced scattered photons provide a more effective, three-dimensional cooling of the nanosphere motion, immediately allowing us to reach strong cooperativity in high vacuum. |
Wednesday, March 6, 2019 8:36AM - 8:48AM |
K24.00004: ABSTRACT WITHDRAWN
|
Wednesday, March 6, 2019 8:48AM - 9:00AM |
K24.00005: Coupled Piezoelectric and Optomechanical Resonators for RF-to-optical Frequency Conversion Marcelo Wu, Biswarup Guha, Krishna Coimbatore Balram, Kartik A Srinivasan The development of quantum computing technologies currently faces interconnectivity barriers. A leading platform for quantum processors uses superconducting microwave or radio-frequency (RF) circuits encased inside dilution refrigerators at millikelvin temperatures. Long-range communication is thus a major challenge due to loss of signal outside cryogenic environment. Recently, RF-to-optical photon converters have attracted significant interest for their use in linking RF signals to an optical signal that can propagate in high-speed low-loss optical fiber networks. We propose an on-chip nanoscale converter that connects RF signals to mechanical degrees of freedom using a piezoelectric resonator and then bridges to the optical domain using an optomechanical resonator. This effective electro-mechano-optical modulator is built on a GaAs material platform which exhibits strong photoelastic effect for optomechanical coupling. We demonstrate new device designs that compensate for the inherently low piezoelectric effect in GaAs and progress in the fabrication of an integrated piezo-optomechanical device. |
Wednesday, March 6, 2019 9:00AM - 9:12AM |
K24.00006: Laser heating of a charged gold nanosphere levitated in an ion trap at high vacuum Joyce Coppock, Samuel Klueter, José Hannan, Bruce E Kane Levitation of a nanoparticle in high vacuum decouples the particle from its environment and enables sensitive thermodynamic measurements; specifically, a levitated particle can be heated in a controlled manner via illumination with a laser. We confine an electrically charged gold nanosphere in a quadrupole electric field trap at pressures as low as 1x10-8 Torr and illuminate it with a linearly polarized 532 nm laser. Accurate measurements of the particle’s charge-to-mass ratio, combined with observations of single discharge events, give a precise determination of its mass. We observe that the particle begins to evaporate at sufficiently high laser powers; from the evaporation rate, we can deduce its internal temperature. In this talk, we present evidence of the heating of 250 nm gold spheres to temperatures in the range of 1000-1250 K, near the melting temperature of 1337 K. Further heating of the particle should enable trapping and observation of a molten droplet. |
Wednesday, March 6, 2019 9:12AM - 9:24AM |
K24.00007: Engineering dissipation dilution of strained nanomechanical resonators Sergey Fedorov, Nils Johan Engelsen, Mohammadjafar Bereyhi, Alberto Beccari, Amir Hossein Ghadimi, Ryan Schilling, Dalziel Wilson, Tobias Kippenberg Dissipation dilution by tensile strain enables micro- and nano- mechanical resonators that have quality factors (Q) exceeding those of bulk vibrations in the same material by orders of magnitude. For a long time, uniform beam- and membrane- shape resonators made of high-stress stoichiometric silicon nitride have been the system of choice to attain high Q and low effective mass—key parameters in force sensing and cavity optomechanics. Recently it was discovered that dissipation dilution (and hence Q) can be increased substantially in non-uniform resonators through techniques such as “soft clamping”, engineering local strain and “tapered clamping”. We show that soft clamping combined with strain engineering can be applied to nanobeams to produce record-high quality factors up to 800 million at room temperature and Q × frequency exceeding 10^15 Hz. The complementary tapered clamping approach results in enhanced Q for the fundamental flexural mode, unachievable with soft clamping. Time permitting, we will also present results on dissipation dilution engineering of membranes and cavity optomechanics with engineered resonators. |
Wednesday, March 6, 2019 9:24AM - 9:36AM |
K24.00008: Phononic integrated circuit Wei Fu, Zhen Shen, Chang-Ling Zou, Yuntao Xu, Risheng Cheng, Hong X Tang The hallmark of a photonic integrated circuit is the utilization of high-index-contrast optical waveguides to route photons and to form complex photonic circuits on a planar chip without creating suspended structures. Despite many similarities between optical and acoustic waves, phononic waveguides analogous to planar optical waveguides remain elusive to the research community, preventing the formation of phononic integrated circuits with a complexity on par with the photonic counterpart. Here we experimentally realize such a phononic integrated circuit architecture through exploiting GaN-on-sapphire platforms which provide efficient confinement and routing of phonons in the top layer. By demonstrating the key building blocks of the phononic circuits, the scalability of this platform and its full analogy to photonic circuits are firmly established. Such phononic integrated circuits will play an important role in the upcoming hybridized phononic chips for manipulating, transferring, storing, and converting classical and quantum information. |
Wednesday, March 6, 2019 9:36AM - 9:48AM |
K24.00009: Radio-frequency optomechanical characterization of a silicon nitride drum Anna Pearson, Kiran Khosla, Matthias Mergenthaler, George Andrew Davidson Briggs, Edward Laird, Natalia Ares On-chip actuation and readout of mechanical motion is key for characterizing mechanical resonators and exploiting them for new applications. We capacitively couple a silicon nitride membrane to an off-resonant radio-frequency cavity formed by a lumped element circuit. Despite a low cavity quality factor of about 7.4 and off-resonant, room temperature operation, we are able to parametrize several mechanical modes and estimate their optomechanical coupling strengths. This enables fast characterization of a device without requiring a superconducting cavity, thereby eliminating the need for cryogenic cooling. We also observe optomechanically induced transparency and absorption which is crucial for a number of applications including sensitive metrology, ground state cooling of mechanical motion, and slowing of light. |
Wednesday, March 6, 2019 9:48AM - 10:00AM |
K24.00010: Realization of directional amplification in a microwave optomechanical device Laure Mercier de Lépinay, Erno Damskägg, Caspar Ockeloen-Korppi, Mika Sillanpää Directional transmission or amplification of microwave signals is indispensable in various applications involving sensitive measurements. Using a device including two on-chip superconducting resonators and two metallic drumhead mechanical oscillators, we experimentally demonstrate how to use this generic cavity optomechanical system to non-reciprocally amplify microwave signals. Pumping this device at four distinct microwave frequencies allows to design two transmission paths for excitations from one microwave port of the device to another, that can be made to interfere constructively or destructively depending on the signals's propagation direction. As a result, we demonstrate amplification in one direction by 9 decibels and a simultaneous isolation in the opposite direction by 21 decibels. |
Wednesday, March 6, 2019 10:00AM - 10:12AM |
K24.00011: Strong Multimodal Coupling in 2D Material based NEMS Resonator Parmeshwar Prasad, Nishta Arora, Akshay Naik Cooling macroscopic objects to their ground state is a long-standing goal for studying quantum mechanics in them. Cooling macroscopic objects require strong coupling to the surrounding environment. A Strong coupling ensures efficient energy exchange between the system and the surrounding. To cool an object to the ground state, the surrounding temperature should be low enough and the frequency of system oscillation high. That is why laser cooling of atoms and molecules are easier as compared to the macroscopic objects such as nano/micro electro mechanical systems (NEMS/MEMS). NEMS resonators are cooled close to the quantum regime by coupling the resonator to the high frequency microwave or optical cavity. In this way, two systems coupled to each other are required, one with the low frequency and another with high frequency. Here in the present work, we engineer a single resonator made of two-dimensional material to ool its low frequency mechanical mode. Using a single macroscopic NEMS resonator will reduce the complexity in the cooling experiments. Also, strong coupling among the multiple modes in a single resonator will ease the requirement of ultra-low surrounding temperature. |
Wednesday, March 6, 2019 10:12AM - 10:24AM |
K24.00012: Coupling of single photon emitters in hBN to microcavities Nicholas Proscia, Harishankar Jayakumar, Zav Shotan, Gabriel Lopez-Morales, Xiaochen Ge, Weidong Zhou, Carlos A. Meriles, Vinod M Menon Hexagonal Boron Nitride (hBN) was recently found to be a source of single photon emitters (SPE) which exhibit desirable properties such as narrow room-temperature linewidths, spectral tunability and operation under ambient conditions. Despite these advantageous properties, scalable integration of these emitters into chip-based cavities has proven elusive. Here, we demonstrate coupling of hBN defect emission to Si3N4 microdisk cavities by exploiting the topography of the cavity structure to engineer strain and thereby activate SPEs which near field couple to the cavities. We find the cavity coupled emission to have a Purcell enhancement of 1.3, close to the cavity’s theoretical Purcell factor of 1.6. The present work is a first step towards cavity enhanced SPEs in this material system and paves the way for deterministic cavity coupling of SPEs that operate at room temperature. |
Wednesday, March 6, 2019 10:24AM - 10:36AM |
K24.00013: Valley-Mechanical Coupling in a Monolayer Semicondoctor Haokun Li, King Yan Fong, Hanyu Zhu, Quanwei Li, Siqi Wang, Sui Yang, Yuan Wang, Xiang Zhang The interaction of macroscopic mechanical object with electron charge and spin plays a vital role in today’s information technology and fundamental studies of the quantum-classical boundary. Recently emerged valleytronics encodes information to the valley degree-of-freedom and promises exciting applications in communication and computation. We realize valley-mechanical coupling in a monolayer MoS2 resonator and demonstrate transduction of valley information to the mechanical states. The valley and mechanical degrees-of-freedom are coupled through the magnetic moment of the valley carriers under a magnetic field gradient. We identify the valley-actuated mechanical motion by optical interferometry and attain a transduction confidence level near unity. Our experiment lays the foundation for a new class of valley-controlled mechanical devices and facilitates realization of hybrid quantum valley-mechanical systems |
Wednesday, March 6, 2019 10:36AM - 10:48AM |
K24.00014: Interference effects in cavity optomechanics with hybridized membranes Ondrej Cernotik, Claudiu Genes, Aurelien Dantan Radiation pressure forces in cavity optomechanics allow for efficient cooling of motion, the manipulation of photonic and phononic quantum states, as well as generation of optomechanical entanglement. The standard mechanism relies on the cavity photons directly modifying the mechanical state. Hybrid cavity optomechanics provides an alternative approach by coupling mechanical objects to quantum emitters, either directly or indirectly via the common interaction with a cavity field mode. In these systems, the interference between forces from the cavity field and the emitters can give rise to novel optomechanical phenomena. We analyze two such hybrid optomechanical systems where a vibrating membrane is doped by quantum emitters or patterned with a photonic crystal structure. In particular, we demonstrate that, in the former system, a three-body interaction between the cavity field, emitters, and mechanical motion can be used to improve cooling of the mechanical motion [1]. Second, we show that, when an esnemble of emitters or a photonic crystal structure in the membrane strongly modifies the membrane reflectivity, the cavity linewidth can be significantly reduced and the system can reach the sideband resolved regime. |
Wednesday, March 6, 2019 10:48AM - 11:00AM |
K24.00015: Trapping Ultracold Fermionic Atoms in a Ring Bowtie Cavity Kevin Wright, Yanping Cai, Daniel Allman We have trapped ultracold fermionic atoms (6Li) in a ring cavity for the first time. The cavity is in a symmetric ring bowtie configuration with all glass-construction for compatibility with UHV environments and experiments requiring large magnetic fields for tuning atomic interactions. The high finesse and excellent passive mechanical stability of the cavity facilitate the creation of smooth, stable trapping potentials, with depths of up to 1 mK. The atoms can also be placed in a crossed-beam dipole trap, a 1D optical lattice, or a 2D optical lattice by varying the configuration of the cavity pump fields. After reporting on the performance of this first cavity, we will describe plans to use cavities of this type to study coupled atom-cavity systems in previously unexplored configurations |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700