Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session A34: Hybrid/Macroscopic Quantum Systems, Optomechanics, and AMO Systems IFocus Recordings Available
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Sponsoring Units: DAMOP DQI Chair: Tejas Deshpande, Northwestern University Room: McCormick Place W-193A |
Monday, March 14, 2022 8:00AM - 8:36AM |
A34.00001: Apker Award (2021): Coherent Dynamics and Quantum States of Ultracold Atoms in Lattices with Ring Topology Invited Speaker: Caelan Brooks We consider ultracold atoms trapped in a toroidal trap with an azimuthal lattice for utility as a macroscopic simulator of quantum optics phenomena [1]. We examine the dynamics induced by the adiabatic introduction of the lattice that serves to couple the normal modes, as an analog of a laser field coupling electronic states. The system is found to display two distinct behaviors, manifest in the angular momentum - coherent oscillation and self-trapping - reminiscent of non-linear dynamics, yet not requiring interatomic interactions. The choice is set by the interplay of discrete parameters, the specific initial mode and the periodicity of the lattice. However, rotation can cause continuous transition between the two regimes, causing periodic quenches and revivals in the oscillations as a function of the angular velocity. Curiously, the impact of rotation is determined entirely by the energy spectrum in the absence of the lattice, a feature that can be attributed to adiabaticity. We assess the effects of varying the lattice parameters, and consider applications in rotation sensing. |
Monday, March 14, 2022 8:36AM - 8:48AM |
A34.00002: Multiphonon transitions in a quantum electromechanical system Wayne Crump, Mika Sillanpaa, Alpo Välimaa, Mikael Kervinen We investigate and measure the multiphonon transitions of a system comprised of a superconducting qubit coupled to a high overtone bulk acoustic resonator (HBAR). The measured spectrums are found to show distinctly non-classical features, providing additional evidence for the quantization of GHz sound. These multiphonon peaks are found to shift with higher driving amplitude which is explained by the dressing of many multiphonon transitions, and a model is derived to calculate these shifts. |
Monday, March 14, 2022 8:48AM - 9:00AM |
A34.00003: Detection of gravitational waves and dark matter using atom interferometry (MAGIS-100) Tejas Deshpande The successful detection of gravitational waves (GWs), originating from a binary black hole merger, by the Laser Interferometer GW Observatory (LIGO), in 2015, not only opened a new window into the universe, but also inspired complementary GW detection schemes using a multitude of quantum technologies. One such technology is atom interferometry. This talk discusses recent progress toward the design and construction of a 100 m baseline atom interferometer (AI) at Fermilab. AIs like these would, in principle, enable detection of not only GWs in the low-frequency band (0.03-3 Hz), but also certain classes of ultralight dark matter (ULDM). |
Monday, March 14, 2022 9:00AM - 9:12AM |
A34.00004: Robust design and assembly of a phononically-shielded electro-mechanical-optical converter Kazemi Adachi, Sarang Mittal, Maxwell D Urmey, Benjamin M Brubaker, Robert D Delaney, Luca Talamo, SHENG-XIANG LIN, Cindy A Regal, Konrad Lehnert A bidirectional, quantum-coherent microwave-to-optical converter is a long-standing technological goal that would enable disparate quantum computational nodes based on superconducting circuits to be interconnected with optical fibers. We construct such a converter by simultaneously coupling a mechanical mode of a SiN membrane to superconducting LC circuit and optical Fabry-Perot cavity. Even at millikelvin temperatures, a high mechanical quality factor is crucial to reducing the added noise due to the MHz scale frequency of the membrane. We have implemented a phononic shield that isolates the membrane from its thermal environment within the complex requirements of the electro-optic circuit, and have achieved a mechanical Q of greater than 12 million. Additionally, we will present a new flip chip construction method that provides reliable electromechanical coupling without sacrificing the improvements to the mechanical Q. |
Monday, March 14, 2022 9:12AM - 9:24AM |
A34.00005: Time-resolved optomechanical dynamics of In(Ga)As quantum dots modulated by surface acoustic waves Michael Choquer, Michelle Lienhart, Emeline D Nysten, Matthias Weiss, Kai Muller, Jonathan Finley, Hubert Krenner, Galan Moody Surface acoustic waves (SAW) are an attractive platform for coupling to a variety of quantum systems, including superconducting qubits [1, 2], defect spins in diamond [3, 4], and optically-active InGaAs quantum dots (QDs) [5]. Here, we demonstrate the enhanced optomechanical coupling between a planar SAW cavity driven by superconducting electronics and single QDs transferred onto a strongly piezoelectric substrate, LiNbO3, via epitaxial lift-off [6]. Using time-correlated single-photon counting, we resolve the temporal dynamics of the modulated QD exciton transition under coupling to various SAW cavity modes, showing energy-level splittings consistent with strain modulation via the GaAs deformation potential. Analysis of the dynamics versus SAW frequency may show evidence of novel acoustic-drive wave mixing. These results point to the potential for SAW electro-optomechanics in a multifunctional integrated platform that combines phononic, optical, and superconducting electronic quantum systems. |
Monday, March 14, 2022 9:24AM - 9:36AM |
A34.00006: Non-destructive optical readout of a superconducting qubit Robert D Delaney, Maxwell D Urmey, Sarang Mittal, Benjamin M Brubaker, Jonathan M Kindem, Peter S Burns, Luca Talamo, Kazemi Adachi, SHENG-XIANG LIN, Cindy A Regal, Konrad Lehnert Entangling superconducting quantum processors via light would enable new means of secure communication and distributed quantum computing. However, transducing quantum signals between these disparate regimes of the electromagnetic spectrum remains an outstanding goal and interfacing superconducting qubits with electro-optic transducers presents significant challenges due to the deleterious effects of optical photons on superconductors. An ideal transducer should leave the state of the qubit unchanged: more precisely, the backaction from the transducer on the qubit should be minimal. Here we demonstrate non-destructive optical readout of a superconducting transmon qubit via a continuously operated electro-optic transducer. The modular nature of the transducer and circuit QED system used in this work enable complete isolation of the qubit from optical photons, and the backaction on the qubit from the transducer is less than that imparted by thermal radiation from the environment. We show that moderate improvements in transducer bandwidth and added noise should enable the transduction of non-classical signals from a superconducting qubit to the optical domain. |
Monday, March 14, 2022 9:36AM - 9:48AM |
A34.00007: Optomechanical Quantum Transduction Control Protocol Huo Chen, Mekena L Metcalf, Marti Vives Quantum transducer technologies that convert between static, microwave qubits and flying, optical qubits are the back-bone infrastructure technology and enabler for the Quantum Internet. Among existing platforms, optomechanical transduction is a mature technology with demonstrated high conversion efficiency between microwave and optical photons. Current demonstrations are based on cavities with constant driving fields to pump photons and amplify the optomechanical coupling strength. Given the advances in pulsed control for superconducting circuits, we proposed pulsed driving fields to enhance the conversion efficiency. We present a theoretical framework for time-dependent control of the driving lasers based on the input-output formalism of quantum optics, and derive an analytical formulation for the linear time-varying equation of motion in the strongly-dissipative limit. Using both analytics and numerics, we show how pulsed control schemes can enhance the conversion efficiency, paving the way for more advanced optomechanical control protocols. |
Monday, March 14, 2022 9:48AM - 10:00AM |
A34.00008: Coupling planar superconducting qubits to High-overtone Bulk Acoustic Resonators (HBARs) Jasper Franse We propose a new planar geometry to couple superconducting qubits to High-overtone Bulk Acoustic Resonators (HBARs). Here, the qubits consist of a Nb(TiN) concentric capacitor in parallel with a Superconducting Quantum Interference Device (SQUID) made out of Al/AlOx/Al Josephson junctions. The qubit is deposited onto a cylindrically shaped piezoelectric transducer (AlN) on top of a Sapphire or Silicon substrate. In this configuration, the qubits couple to the AlN, which in turn generate propagating phonons going into the substrate, which acts as a Phononic Fabry-Pérot cavity. This strong interaction between mechanical motion and electromagnetism, opens possibilities within the field of circuit Quantum Acoustodynamics (cQAD). Earlier work showed that the phonon lifetime is limited by diffraction losses in the substrate and thus limiting the phonon quality factor. In our work, we propose to increase this phonon quality factor by altering the substrate geometry by means of deep etching or wet etching. Doing so, we belief that we can confine longitudinal phonon modes and reduce the energy leakage due to diffraction losses and creation of transversal modes inside the substrate. |
Monday, March 14, 2022 10:00AM - 10:12AM |
A34.00009: Diamond nanophotonic structures for quantum spin-photon interfaces Nina Codreanu, Maximilian T Ruf, Julia M Brevoord, Richard A Norte, Simon Groeblacher, Ronald Hanson Future quantum networks require end nodes that combine excellent qubit control and coherence with efficient spin-photon interfaces. Optically active spin qubits in diamond represent an auspicious building block. Among these, the group-IV-vacancy qubits are emerging promising candidates: thanks to inversion symmetry these systems are first-order insensitive to charge noise at surfaces, opening the path towards integration in nanophotonic photonic crystal waveguides and cavities. |
Monday, March 14, 2022 10:12AM - 10:24AM |
A34.00010: Generating continuous-variable cluster states using optomechanics. ANUVETHA GOVINDARAJAN, Mitch Mazzei, Hailin Wang, Lin Tian
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Monday, March 14, 2022 10:24AM - 10:36AM |
A34.00011: Optimized piezo-optomechanical quantum transducer on a hybrid lithium niobate-silicon material platform Piero Chiappina, Jash Banker, Srujan Meesala, David Lake, Steven Wood, Oskar Painter Coherent transduction of single photons from microwave to optical frequencies is expected to play a key role in future quantum networks and distributed quantum computers. We present the design of a piezo-optomechanical quantum transducer optimized for high conversion efficiency and low added noise. In our device, transduction is mediated by a strongly hybridized acoustic mode of a lithium niobate piezoacoustic cavity attached to a silicon optomechanical crystal. This hybrid material platform allows us to design for strong microwave photon-phonon coupling without compromising optomechanical cooperativity. Crucially, we use an acoustic wavelength-scale piezo volume to minimize participation of the lossy piezo region in both electrical and acoustic modes. The resulting transducer acoustic mode is almost silicon-like with single photon piezoelectric and optomechanical coupling rates of MHz-order and an estimated mechanical decoherence rate of order 10kHz. We estimate an intrinsic efficiency of order 10% with <0.5 added noise quanta when resonantly coupled to a typical 5 GHz transmon qubit and operated in pulsed mode at 10 kHz repetition rate. A transducer in this regime is suitable to realize probabilistic schemes for remote entanglement of superconducting quantum processors. |
Monday, March 14, 2022 10:36AM - 10:48AM |
A34.00012: Bulk Acoustic Quantum Transduction I: Designing an Optical Interface for Superconducting Qubits Maxwell Drimmer, Rodrigo Benevides, Hugo Doeleman, Tom Schatteburg, Francesco Adinolfi, Yiwen Chu, Uwe von Lüpke A low-noise, efficient, bi-directional microwave-to-optical transducer could connect superconducting circuits in distant dilution refrigerators, offering a promising route towards powerful, large-scale quantum computers and networks. We present our advances in developing a device in which a Bulk Acoustic Wave (BAW) resonator mediates interactions between the microwave field of a transmon qubit and a telecom-frequency mode of a Fabry-Perot cavity. Strong electromechanical [1] and optomechanical [2] coupling to BAW modes have been demonstrated in individual experiments; now our goal is building a single device capable of both. |
Monday, March 14, 2022 10:48AM - 11:00AM |
A34.00013: Bulk Acoustic Quantum Transduction II: A Brillouin Optomechanical Cavity at mK Temperatures Hugo Doeleman, Maxwell Drimmer, Tom Schatteburg, Dorotea Macri, Rodrigo Benevides, Yiwen Chu A low-noise, efficient, bi-directional microwave-to-optical transducer could connect superconducting circuits in distant dilution refrigerators, offering a promising route towards powerful, large-scale quantum computers and networks. We present our advances in developing a device in which a Bulk Acoustic Wave (BAW) resonator mediates interactions between the microwave field of a transmon qubit and a telecom-frequency mode of a Fabry-Perot cavity. Strong electromechanical [1] and optomechanical [2] coupling to BAW modes have been demonstrated in individual experiments; now our goal is building a single device capable of both. |
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