Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session C33: Quantum AcousticsFocus Session
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Sponsoring Units: DQI Chair: Jared Hertzberg, IBM T J Watson Res Ctr Room: LACC 408B |
Monday, March 5, 2018 2:30PM - 2:42PM |
C33.00001: Coupling of transmon qubits to ultra-high Q phononic bandgap acoustic resonators via an intermediate piezoelectric resonator Jie Luo, Michael Fang, Oskar Painter We present the design, fabrication, and initial characterization of a superconducting transmon qubit coupled to an ultra-high quality (Q>10 billion) phononic crystal cavity, both of which are fabricated from the silicon device of a silicon-on-insulator wafer. In order to avoid the typically large material loss from piezoelectric materials, the qubit-phonon transducing device developed in this work is based on an engineered tunable piezoelectric virtual coupling channel involving an intermediate piezoelectric mechanical resonator hybridized with a tunable microwave resonator. The ability to achieve such a hybrid quantum system can enable new research paths towards a compact on-chip quantum memory element, mechanical quantum state manipulation, and quantum transduction between microwave and optical signals. |
Monday, March 5, 2018 2:42PM - 2:54PM |
C33.00002: Acoustic Traps and Lattices for Electrons in Semiconductors Martin Schuetz, Johannes Knoerzer, Geza Giedke, Lieven Vandersypen, Mikhail Lukin, Ignacio Cirac We propose and analyze a solid-state platform based on surface acoustic waves (SAWs) for trapping, cooling and controlling (charged) particles, as well as the simulation of quantum many-body systems. We develop a general theoretical framework demonstrating the emergence of effective time-independent acoustic trapping potentials for particles in two- or one-dimensional structures. As our main example we discuss in detail the generation and applications of a stationary, but movable acoustic pseudo-lattice (AL) with lattice parameters that are reconfigurable in situ. We identify the relevant figures of merit, discuss potential experimental platforms for a faithful implementation of such an acoustic lattice, and provide estimates for typical system parameters. With a projected lattice spacing on the scale of 100nm, this approach allows for relatively large energy scales in the realization of fermionic Hubbard models, with the ultimate prospect of entering the low temperature, strong interaction regime. Experimental imperfections as well as read-out schemes are discussed. |
Monday, March 5, 2018 2:54PM - 3:06PM |
C33.00003: Bound-in-Continuum qubits with Quantum Acoustodynamics Shangjie Guo, Jacob Taylor Propagating surface acoustic waves (SAW) can be piezo-electrically coupled with superconducting qubits via inter-digital transducers. In the quantum regime, this has recently been used to realize a surface acoustic version of cavity quantum electrodynamics. As the speed of the mechanical waves is $10^5$ times slower than light, this quantum acoustodynamics (QAD) architecture provides new opportunities for exploring the effects of emitters that are much larger than their wavelength, as well as introducing the possible miniaturization of the transmon-like qubit design to sub-mm scales. In this work, we investigate if a circuit QAD transmon inherits the benefits of a circuit QED transmon. We calculate the effects of coupling SAWs to a transmon-like superconducting qubit. Working in the continuum limit, we find the emergence of a bound-in-continuum resonance of the SAW modes, which has favorable damping properties simultaneous with anomalously large vacuum Rabi coupling. This result indicates that acoustic cavities may not be necessary for circuit QAD transmons. |
Monday, March 5, 2018 3:06PM - 3:18PM |
C33.00004: Circuit quantum acoustodynamics with surface acoustic waves Riccardo Manenti, Anton Frisk Kockum, Andrew Patterson, Tanja Behrle, Joseph Rahamim, Giovanna Tancredi, Franco Nori, Peter Leek The experimental investigation of quantum devices incorporating mechanical resonators has opened up new frontiers in the study of quantum mechanics at a macroscopic level. It has recently been shown that surface acoustic waves (SAWs) can be piezoelectrically coupled to superconducting qubits, and confined in high-quality Fabry–Perot cavities in the quantum regime [1]. Here, we present measurements of a device in which a superconducting qubit is coupled to a SAW cavity, realising a surface acoustic version of cavity quantum electrodynamics [2]. We use measurements of the AC Stark shift between the two systems to determine the coupling strength, which is in agreement with a theoretical model. This quantum acoustodynamics architecture may be used to develop new quantum acoustic devices in which quantum information is stored in trapped on-chip acoustic wavepackets, and manipulated in ways that are impossible with purely electromagnetic signals, due to the 105 times slower mechanical waves. |
Monday, March 5, 2018 3:18PM - 3:30PM |
C33.00005: Towards a platform for many-body spin emulation: Cavity quantum acoustic device in the multi-mode strong coupling regime Bradley Moores, Lucas Sletten, Jeremie Viennot, Konrad Lehnert Coupling many qubits to a dense cavity spectrum has been proposed as a means of engineering finite-range interactions among many qubits for analog quantum emulation. Although the circuit quantum electrodynamics (cQED) architecture is perhaps the most advanced quantum information technology, building a system of many qubits coupled to a multi-mode cavity is hindered by the mismatch of scales between the transmons and the electromagnetic modes. Here we investigate an acoustic analog of cQED by replacing the electromagnetic resonators with acoustic cavities. In particular, we couple a single tunable transmon to a 300 micron long surface acoustic wave (SAW) resonator. We show that the resonator supports a dense spectrum of high-Q microwave-frequency modes that couple piezoelectrically to the transmon through an interdigitated SAW transducer. For some modes, the qubit-cavity coupling reaches 6.5 MHz, exceeding the cavity loss rate 200 kHz, qubit linewidth 1.1 MHz, and the free spectral range 4.8 MHz, placing the device in both the strong coupling and strong multi-mode regimes. Crucially, we observe that the qubit linewidth strongly depends on its predicted emission of propagating phonons, and identify operating frequencies where the emission rate is suppressed. |
Monday, March 5, 2018 3:30PM - 3:42PM |
C33.00006: Coupling a 4 GHz Surface Acoustic Wave Resonator to a Superconducting Qubit Kevin Satzinger, Audrey Bienfait, Hung-Shen Chang, Ming-Han Chou, Agnetta Cleland, Chris Conner, Etienne Dumur, Joel Grebel, Ivan Gutierrez, Ben November, Greg Peairs, Rhys Povey, Ender Sahin, Samuel Whiteley, You-Peng Zhong, David Schuster, Andrew Cleland Surface acoustic wave (SAW) devices represent a mature technology in classical signal processing. SAWs have also been proposed as a method of coherently coupling disparate quantum systems. Several groups have reported experimental results coupling SAWs and other mechanical systems to superconducting qubits. In this talk, we explore important design and fabrication considerations for coupling a 4 GHz SAW resonator to a superconducting qubit while maintaining high qubit coherence. We examine how the coupling architecture, material properties, and resonator design influence the impedance matching between the resonator and qubit. Following these considerations, we design and fabricate devices and present experimental results. |
Monday, March 5, 2018 3:42PM - 3:54PM |
C33.00007: Strong coupling of a transmon qubit to propagating surface acoustic waves Andreas Ask, Göran Johansson Recently, a transmon qubit predominantly coupling to propagating Surface Acoustic Waves (SAW) was experimentally demonstrated [1]. The coupling was achieved by forming the shunting capacitance of the qubit into an interdigital transducer (IDT). By choosing a material with strong piezoelectricity, it is possible to reach coupling strengths where the spontaneous emission rate is comparable to the qubit level splitting. In this study, we theoretically explore the effect of increasing the coupling beyond the previously analysed weak coupling regime [2]. In particular, we analyse the case when the smallest energy scale of the problem is the transmon anharmonicity. In the limit of vanishing anharmonicity, we recover the classical linear description from our full quantum model. |
Monday, March 5, 2018 3:54PM - 4:06PM |
C33.00008: Quantum acoustics with lithium niobate on silicon Patricio Arrangoiz-Arriola, E. Alex Wollack, Zhaoyou Wang, Marek Pechal, Nathan Lee, Jeremy Witmer, Jeff Hill, Amir Safavi-Naeini
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Monday, March 5, 2018 4:06PM - 4:42PM |
C33.00009: Investigations and Potential Applications of Qubit-Nanoresonator-Cavity Interactions in a Superconducting Quantum Electromechanical System Invited Speaker: Matthew LaHaye Quantum electromechanical systems composed of integrated superconducting qubits, microwave circuit modes and nanomechanical elements have the potential to serve as versatile platforms for investigations of the quantum properties of motion and quantum thermodynamics, as well as resources for quantum information processing. In my talk I will give an overview of these systems and then highlight ongoing work in my group to develop one such quantum electromechanical system that consists of a superconducting transmon qubit, flexural nanomechanical resonator, and superconducting waveguide cavity1. Recent theoretical investigations suggest this system has promise as a tool for quantum state generation2 and as an element for quantum simulation architectures3,4. I will discuss our initial results to characterize and model this system and identify critical challenges to overcome for implementing it in future applications. |
Monday, March 5, 2018 4:42PM - 5:18PM |
C33.00010: Hybrid systems with bulk acoustic wave resonators Invited Speaker: Yiwen Chu The ability to engineer and manipulate different varieties of quantum mechanical objects allows us to take advantage of their unique properties and create powerful hybrid technologies. Our recent work indicates that bulk acoustic wave (BAW) resonators can be used as a highly coherent mechanical object for implementing and understanding quantum systems. In this talk, I will focus on our demonstration of strong coupling between a BAW resonator and a superconducting qubit. The long coherence times and high cooperativity of the system enable quantum operations on the phonons. In addition, I will briefly describe our experiments using a combination of microwave circuits, BAW resonators, and infrared optics for transduction and high sensitivity measurements of materials properties. |
Monday, March 5, 2018 5:18PM - 5:30PM |
C33.00011: SAW Devices for Coupling Superconducting Quantum Systems Etienne Dumur, Kevin Satzinger, Audrey Bienfait, Hung-Shen Chang, Ming-Han Chou, Chris Conner, Joel Grebel, Ivan Gutierrez, Ben November, Greg Peairs, Rhys Povey, Ender Sahin, You-Peng Zhong, Andrew Cleland Surface acoustic wave (SAW) devices are heavily used in classical signal processing applications. SAWs have also been proposed as a method to coherently couple disparate solid-state quantum systems, such as superconducting and semiconducting qubits. In this talk, we report the development of SAW devices to couple superconducting quantum devices to one another. We explore SAW devices ranging in frequency from 0.6 to 4 GHz, in terms of design, fabrication and characterization measurements. We focus specifically on the Distributive Acoustic Reflection Transducer (DART), a uni-directional transducer that has not previously been developed for applications above a few hundred MHz, and the multi-strip coupler (MSC), used to fan-out the coupling signal. We examine the influence of material properties on the performance of these devices, as well as design considerations including impedance matching and electrical bandwidths. |
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