Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q66: DAMOP: Hybrid Quantum Systems IIFocus
|
Hide Abstracts |
Sponsoring Units: DAMOP Chair: Eduardo Ibarra Garcia Padilla, University of California, Davis Room: Room 413 |
Wednesday, March 8, 2023 3:00PM - 3:36PM |
Q66.00001: Shaping and Controlling Quantum Photonic States Using Free Electrons Invited Speaker: Gefen Baranes Continuous variable quantum computing is a rapidly developing field both theoretically and experimentally. It provides a promising approach for fault-tolerant quantum computing while enabling error correction using bosonic codes, such as GKP codes. |
Wednesday, March 8, 2023 3:36PM - 3:48PM |
Q66.00002: Cavity Optomechanics in Solid Helium and Solid Neon Akshai Jayakumar Pillai, Yogesh Patil, Yizhi Luo, Peter T Rakich, Jack G. E Harris Cavity optomechanical systems have been used to realize highly sensitive metrological devices and are also proposed as a tool for studying questions in fundamental physics [1,2]. We have previously demonstrated an optomechanical system using an optical fiber cavity filled with superfluid He [3,4], in which an optical mode (wavelength = 1550 nm) couples to an acoustic mode of the superfluid with precisely half the wavelength. This acoustic mode has a resonance frequency of 320 MHz, and so is cooled to a mean phonon number ~ 1 in a conventional dilution refrigerator. Here we look at the feasibility of using solid He and Ne crystals as the medium in such cavities, as their greater sound velocity will result in 1550 nm light coupling to acoustic modes at 600 MHz and 1.4 GHz respectively. As the crystals are acoustically anisotropic, we use the Christoffel equation and finite element simulations to find the acoustic eigenmodes of the cavity. The spatial profiles of these eigenmodes depend on the angle between the crystal axis with the cavity axis. We find that for a range of crystal orientations, there exist eigenmodes whose spatial profiles closely resemble a Gaussian. These acoustic eigenmodes are predicted to have a high degree of overlap with the optical Gaussian mode, and thus are good candidates to realize a large optomechanical coupling. |
Wednesday, March 8, 2023 3:48PM - 4:00PM |
Q66.00003: Optomechanics with phononic modes in superfluid thin-film helium Alexander R Korsch, Niccolo Fiaschi, Simon Gröblacher In recent years, nanomechanical oscillators in thin films of superfluid helium-4 have attracted attention in the field of optomechanics due to their exceptionally low mechanical dissipation and optical scattering. Here, we study surface waves – so-called ‘third sound’ – in superfluid helium thin films self-assembled on silicon nanobeam optical cavities. By embedding nanobeam cavities in helium-4 gas and cooling the system below the superfluid transition temperature, nanometer thin films of superfluid helium form on the resonator surface. Surface waves in the superfluid helium film couple dispersively to the optical cavity mode by spatial modulation of the refractive index. We characterize the mechanical properties and optomechanical coupling of third sound modes on the nanobeam surface by measuring time-resolved oscillations of the optical cavity resonance and homodyne detection of the mechanical spectrum. We find mechanical mode frequencies in the range of 1 – 50 MHz in agreement with finite-element simulations. This work is a step towards realizing strong mechanical non-linearities that were recently theoretically predicted in superfluid thin-film phononic crystals [1]. |
Wednesday, March 8, 2023 4:00PM - 4:12PM |
Q66.00004: Stabilizing topological transport in a non-Hermitian system Justin R Lane, Chitres Guria, Vishnu Chavva, Toni D Montalvo, Hugo Ribeiro, Jack G. E Harris When the dynamical matrix (or “Hamiltonian”) of a non-Hermitian system is tuned around a closed loop in the vicinity of an exceptional point (EP), the system’s complex eigenvalues trace out a braid. The particular braid traced out is a topological property of the loop, determined only by how the loop encloses EP2, the space of doubly degenerate EPs. While in principle adiabatic loops in parameter space could be used to execute braid operations to exponential accuracy in the loop time, the dynamics at long times is dominated by gain-loss effects and adiabatic evolution breaks down. We discuss schemes for shortcuts to adiabaticity, a class of techniques for generating control sequences that emulate adiabatic evolution on finite timescales, with the goal of dynamically executing braids by encircling exceptional points. We also discuss progress experimentally implementing these control sequences on a set of nearly degenerate vibrational modes of a SiN membrane optomechanically coupled to an optical resonator, and strategies for tailoring control sequences to account for experimental limitations. |
Wednesday, March 8, 2023 4:12PM - 4:24PM |
Q66.00005: High-capacity cooling of superconducting circuits with superfluid helium for microwave-to-optical quantum transduction Chunzhen Li, Mingrui Xu, Wei Fu, Yuntao Xu, Mohan Shen, Sihao Wang, Xu Han, Dafei Jin, Xinhao Li In the past decade, hybrid superconducting platforms such as electro-optical, and electro-optomechanical systems have been extensively studied for building the quantum interface between superconducting quantum systems and photonic distribution networks. In these transducers, a strong optical drive is typically required to parametrically enhance the interaction between microwave and optical fields. However, the absorption of optical drive photons also introduces undesired noise and frequency shift of the superconducting resonator, undermining the performance of quantum signal transduction. To tackle this challenge, we achieved enhanced cooling capacity by submerging a cavity electro-optical transducer in superfluid helium, leveraging its tremendous heat transport characteristics. We demonstrated that the heating effect through optical photon absorption of the device substrate and packaging is largely suppressed, allowing a 30-dB improvement in the microwave-to-optical transduction throughput. On the other hand, the direct quasiparticle generation from photon absorption by the superconductor is unchanged. This study lays out a pathway to building a more efficient superconducting-photonic interface for future quantum networks. |
Wednesday, March 8, 2023 4:24PM - 4:36PM |
Q66.00006: Studies of High-Q Phononic Resonator for Quantum Acoustic Applications Yizhi Luo, Taekwan Yoon, David Mason, Naijun Jin, Prashanta Kharel, Robert J Schoelkopf, Peter T Rakich High-Q phononic resonators hold tremendous potential as the basis for solid-state quantum storage, however, many technical challenges must be addressed before we can harness their remarkable storage times as the basis for high-fidelity quantum memories and sensor technologies. Long coherence time is difficult to achieve without a good understanding of the material quality as well as the surface losses. In this work, we apply a new non-invasive laser-based spectroscopy method to the study of phonon coherence in high-purity crystals. Using a novel reflow-based fabrication technique, we shape the faces of pristine crystalline quartz substrates to form a stable phononic resonator that supports high Q-factor bulk acoustic modes. We interrogate the modes of this phononic resonator using stimulated Brillouin scattering measurements. To differentiate the geometric loss (e.g. clipping loss and surface scattering loss) from the material loss (e.g. dislocations, impurities, internal stress, etc.) we use the fabricated device topography as inputs to a new acoustic mode solver that computes the geometric component of loss. Using these new spectroscopic techniques and device simulations in conjunction with quantitative measurements of defects and impurities, we work to build record-breaking high-Q phononic resonators for high-coherence quantum acoustic technologies. |
Wednesday, March 8, 2023 4:36PM - 4:48PM |
Q66.00007: An optomechanical lock-in amplifier with intracavity radiation pressure mediated gain Aaron Markowitz, Shruti Maliakal, Christopher Wipf, rana X adhikari Quantum metrology applications leveraging highly squeezed states of light, including next-generation gravitational wave detectors, can be limited by mode-matching, photodetection, and other optical losses in the readout chain. Phase-sensitive ponderomotive pre-amplification can protect quantum noise limited signals from such downstream losses without introducing excess input-referred loss. We describe a tabletop traveling wave cavity in which a 1550nm pump tuned on-resonance coherently mixes with amplitude sidebands of a homodyne probe field to drive a gram-scale silicon resonator. The resulting cavity length fluctuations induce phase fluctuations in the reflected pump, which are sensed through Pound-Drever-Hall locking. We present the audio-band gain performance and noise budget of the initial demonstration. Ongoing work may bring the amplifier's input-referred noise well below vacuum shot noise by canceling pump relative intensity noise through a balanced Mach-Zehnder configuration and reducing thermal noise through cryogenic (123K) operation. |
Wednesday, March 8, 2023 4:48PM - 5:00PM |
Q66.00008: Nonlinear Nanomechanical Resonator Approaching the Quantum Ground State Christoffer B Moller, Roger Tormo Queralt, Chandan Samanta, Sergio L De Bonis, David Czaplewski, Fabio Pistolesi, Adrian Bachtold We present measurements of a strong mechanical nonlinearity near the quantum ground state. The mechanical nonlinearity is generated by the ultrastrong coupling (500MHz) of a carbon nanotube mechanical resonator (30MHz) to an embedded quantum dot undergoing single-electron tunneling. The nonlinearity is far bigger than what has been realized thus far and results in highly nonlinear thermal vibrations. As the average displacement amplitude is decreased to 13 times the zero-point motion, approximately 42% of the thermal energy is stored in the anharmonic part of the potential. We also present transport measurements of clean and regular double quantum dot devices defined using a novel nanofabrication process. Such devices are necessary to coherently manipulate the nonlinear mechanical resonator in order to create mechanical qubit [1]. |
Wednesday, March 8, 2023 5:00PM - 5:12PM |
Q66.00009: Relaxation and dynamics of pre-displaced string resonators Menno Poot, Xiong Yao, David Hoch Previously, we demonstrated that silicon nitride beams with a designed pre-displacement partially relax upon release, enabling geometric tuning of stress in micromechanical strings. To understand the statics and dynamics of such structures, an analytical model is developed. Expressions for the bending and tension energy are derived. The potential energies are functionals of the displacement profiles and a modified version of the Euler-Bernoulli equation with tension included is derived. After the projection of the energies and the partial differential equation onto the cosine shape of our devices, the mechanics is described by two variables only. This enables to visualize the energy as potential landscapes, whose shapes determine the resonance frequencies. The results are validated (and extended) with finite-element simulations. Experimentally, we measure the eigenmodes of a large number of devices optomechanically using on-chip MZIs, allowing a systematic study of geometric tuning of the frequencies and quality factors. A number of intriguing experimental results can be explained with the model. It is e.g. found that many of the observed static and dynamic effects are intimately related to buckling. More general applications of the geometric tuning method are also discussed. |
Wednesday, March 8, 2023 5:12PM - 5:24PM |
Q66.00010: All dielectric cavity electro-optic transducers for quantum transduction and sensing Thomas Purdy, Mihir Khanna, YANG HU Electro-optic transducers, where microwave and optical photons can directly exchange information via a nonlinear optical crystal, are a promising route for the quantum transduction, sensing, and detection of microwave signals. We are exploring resonant cavity electro-optic systems, where a high dielectric constant microwave resonator interacts with a Fabry-Perot optical cavity filled with lithium niobate. We have developed several designs for our low mode volume, high Q, all-dielectric resonators including 1D microwave photonic crystal resonators which tile lithium niobate tipped "bowtie" shaped field concentrators and mm-scale cubic "sandwich" devices employing the fundamental TE and TM modes a slab of lithium niobate sandwiched between two slabs of high dielectric constant titanium dioxide. We are developing methods to tune our structures into a triply resonant condition where optical pump photons, microwave photons, and photons at the sum of those frequencies are all resonant with electromagnetic modes our structure, in order to achieve efficient signal transduction. Because our all-dielectric devices operate well at room temperature, we are exploring applications such as temperature metrology via optically detecting microwave blackbody photons. Ultimately, our devices operated at cryogenic temperatures will achieve single photon level microwave – optical quantum transduction to coherently couple superconducting qubits to room temperature fiber optic networks. |
Wednesday, March 8, 2023 5:24PM - 5:36PM |
Q66.00011: Integrated levitated magnetomechanics with single spins via in-situ micromanipulation John D Schaefer, Trisha Madhavan, Emma Rosenfeld, Frankie Fung, Mikhail D Lukin Coupling quantum nonlinearities to mechanics is an outstanding challenge in the field of quantum science. Realizing such a system would prove useful for applications in quantum metrology and quantum information. Previously, we demonstrated a levitated system consisting of micromagnets over a type-II superconductor. The magnet's center of mass was shown to be trapped in three dimensions, resulting in modes at more than 10 kHz and quality factors of ~10^6. We also demonstrated the coupling of the levitated magnet to the spin of a single nitrogen-vacancy center in diamond, ~0.048(2) Hz. We discuss recent improvements to the platform, which will allow us to achieve stronger spin-mechanical couplings, enabling near-term milestones such as the detection of quantum backaction, which is a first step towards mechanics in the quantum regime. In addition, we will also discuss our progression towards an on-chip spin-mechanical system, offering NV centers with microwave control and superconductor trapping on one compact device. This recent progress can be considered a building block towards a scalable quantum device. |
Wednesday, March 8, 2023 5:36PM - 5:48PM |
Q66.00012: Brillouin Optomechanics in the Quantum Ground State Tom Schatteburg, Hugo Doeleman, Silvan Vollenweider, Dorotea Macri, Rodrigo d Benevides, Yiwen Chu Microwave to optical transducers convert quantum states from platforms such as superconducting circuits into the thermal noise-free optical regime, promising a route towards a quantum network using telecom fibers as links. A widespread approach is to use a mechanical resonator as intermediate system that couples to both microwaves and optical photons. One requirement for such a transducer is that the number of noise photons added in the process is much smaller than one, which can only be achieved if the intermediate mechanical resonator is in its quantum ground state. We present the demonstration of a Brillouin cavity optomechanics system operating in a dilution refrigerator, compatible with future integration with superconducting circuits. Using optical sideband asymmetry measurements, we show that the GHz frequency mechanical modes are in the quantum ground state of motion. In addition, we present a series of measurements confirming that the phonon occupation is not affected by direct heating from incident laser power. |
Wednesday, March 8, 2023 5:48PM - 6:00PM |
Q66.00013: Collective dynamics in circuit optomechanical systems Marco Scigliuzzo, Mahdi Chegnizadeh, Amir Youssefi, Navid Akbari, Shingo Kono, Tobias J Kippenberg Optomechanical systems are polyvalent platforms suited for controlling an extremely long-lived mechanical degree of freedom, realizing high-precision sensors, and benchmarking quantum mechanics at a macroscopic scale. Nevertheless, most of their implementation fails to harvest the advantages of multimode systems, mainly due to challenges in realizing reproducible mechanical and optical (microwave) resonances. Here, we investigate multiple nearly degenerate mechanical oscillators optomechanically coupled to a shared microwave cavity, implemented by superconducting mechanically compliant vacuum gap capacitors shunted by spiral inductors. We show that the mechanical resonators undergo a transition from individual to collective dynamics as their optomechanical interactions are enhanced. We finally study the sideband collective cooling of multimode mechanical systems, where one collective mechanical mode is efficiently cooled down while the individual modes remain the large phonon occupations. |
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