Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session U17: Hybrid Systems - Electromechanics, Optomechanics |
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Sponsoring Units: DQI Chair: Charlotte Boettcher, Harvard University Room: 203 |
Thursday, March 5, 2020 2:30PM - 2:42PM |
U17.00001: Entanglement of Microwave-Optical Modes in a Strongly Coupled Electro-Optomechanical System Xu Han, Changchun Zhong, Liang Jiang Quantum transduction between microwave and optics can be realized by quantum teleportation if given reliable entanglement between microwave and optical modes, namely entanglement-based quantum transduction. To realize this protocol, an entangled source with high-fidelity is necessary. Based on a generic strongly coupled cavity electro-optomechanical system, we study the microwave-optical entanglement generation and quantify the frequency entanglement between the two modes. The entanglement can be straightforwardly encoded in frequency-bin degree of freedom with a feasible experiment to verify entangled photon pairs. The experimental implementation is systematically analyzed and the preferable parameter regime for entanglement verification is identified. An inequality is given as a criterion for good entanglement verification including practical imperfections. |
Thursday, March 5, 2020 2:42PM - 2:54PM |
U17.00002: Entanglement of Microwave-Optical Modes in a Strongly Coupled Electro-Optomechanical System Changchun Zhong, Xu Han, Liang Jiang Quantum transduction between microwave and optics can be realized by quantum teleportation if given reliable entanglement between microwave and optical modes, namely entanglement-based quantum transduction. To realize this protocol, an entangled source with high-fidelity is necessary. Based on a generic strongly coupled cavity electro-optomechanical system, we study the microwave-optical entanglement generation and quantify the frequency entanglement between the two modes. The entanglement can be straightforwardly encoded in the frequency-bin degree of freedom with a feasible experiment to verify the entangled photon pairs. The experimental implementation is systematically analyzed, and the preferable parameter regime for entanglement verification is identied. An inequality is given as a criterion for good entanglement verification, including practical imperfections. |
Thursday, March 5, 2020 2:54PM - 3:06PM |
U17.00003: Ground state cooling and high-fidelity quantum transduction via parametrically-driven bad-cavity optomechanics Hoi-Kwan Lau, Aashish Clerk In optomechanical systems, the beam-splitter interaction underlies the utility of many applications, but the two-mode-squeezing interaction creates unwanted excitations and is usually detrimental. In this work, we propose a simple but powerful method based on cavity parametric driving to suppress the unwanted excitation that does not require working with a deeply sideband-resolved cavity. Our approach is based on a simple observation: as both the optomechanical two-mode-squeezing interaction and the cavity parametric drive induce squeezing transformations of the relevant photonic bath modes, they can be made to cancel one another. We illustrate how our method can cool a mechanical oscillator below the quantum back-action limit, and significantly suppress the output noise of a sideband-unresolved optomechanical transducer. |
Thursday, March 5, 2020 3:06PM - 3:18PM |
U17.00004: Mechanical Purcell Filter for Microwave Quantum Machines Agnetta Cleland, Marek Pechal, Pieter-Jan C. Stas, Christopher J Sarabalis, Patricio Arrangoiz-Arriola, Edward A Wollack, Wentao Jiang, Timothy McKenna, Amir Safavi-Naeini Measuring the state of a superconducting qubit introduces a loss channel which can enhance spontaneous emission through the Purcell effect. This can be mitigated by implementing a Purcell filter which strongly suppresses signal propagation at the qubit frequency. If the filter is well-matched at the readout cavity frequency, it will protect the qubit from decoherence channels without sacrificing measurement bandwidth. In this talk, we propose and analyze design for a mechanical Purcell filter, composed of an array of nanomechanical resonators in thin-film lithium niobate, whose frequencies are chosen to produce a bandpass response. A modest footprint, steep band edges, and lack of cross-talk make these filters a novel and appealing alternative to electromagnetic versions currently used in microwave quantum machines. We will present a circuit model depiction of this filter, as well as design, fabrication, and characterization results. Our filters achieve over 200 MHz bandwidth at 3.5 GHz, with over 50 dB out-of-band suppression, while occupying less than 0.3 square mm on-chip in a qubit-compatible material platform. |
Thursday, March 5, 2020 3:18PM - 3:30PM |
U17.00005: Microwave-frequency acoustic resonators with high quality factors Ming-Han Chou, Etienne Dumur, Gregory Peairs, Audrey Bienfait, Hung-Shen Chang, Christopher R Conner, Joel Grebel, Rhys G Povey, Kevin Satzinger, Youpeng Zhong, Andrew Cleland We are pursuing the development of microwave-frequency acoustic resonators that can be integrated with superconducting circuits. By combining the mechanical properties of single crystal silicon with the mechanical isolation provided by phononic crystals, high quality factors at GHz frequencies should become achievable. In this talk, we describe the design and fabrication of mechanical resonators comprising suspended hybrid structures combining aluminum nitride and silicon supported by a phononic crystal, providing mechanical isolation with an integrated piezoelectric transduction mechanism. Measurements at low temperatures indicate this type of mechanical device can achieve quality factors approaching those of coplanar waveguide resonators, providing interesting potential for use in quantum information applications. |
Thursday, March 5, 2020 3:30PM - 3:42PM |
U17.00006: A multimode nonlinear resonator for quantum acoustics Gustav Andersson, Shan Williams Jolin, Marco Scigliuzzo, Per Delsing Exploiting multiple modes in a quantum acoustic device could enable applications in quantum information in a hardware-minimal setup. Surface Acoustic Wave (SAW) resonators in the quantum regime support high Q-factors (>10^5) and dense mode spectra. We introduce a Kerr nonlinearity to a SAW resonator by integrating a SQUID (Superconducting QUantum Interference Device) into one of the Bragg reflectors. The SQUID inductance modulates the reflectivity of each unit cell in the mirror and hence the effective length of the resonator. Due to the narrow free spectral range, this gives rise to a cross-Kerr coupling between the more than 20 accessible modes. We attempt to exploit this nonlinear coupling to generate multimode non-classical states that could potentially provide a resource for quantum computation. Avenues towards quantum simulation using the coupled modes as lattice sites occupied by SAW phonons are further explored. |
Thursday, March 5, 2020 3:42PM - 3:54PM |
U17.00007: Existence of a new surface mode with transverse electric field Zongye Wang, Xuedong Hu Surface acoustic waves, in particular Rayleigh waves near the surface of a piezoelectric material, have attracted a lot of attention lately through their abilities to carry electrons and to couple strongly with superconducting qubits. Here we report the study of a surface mode in a piezoelectric material with transverse electric field, which has not been explored in previous studies of surface acoustic waves. This transverse mode is different from both the well-understood Rayleigh wave that contains a longitudinal component, and the Bleustein-Gulyaev wave, which has been actively studied recently. In order to describe surface modes with transverse electric field, we develop a theory of elastic waves coupled with electromagnetic field, and find among its solutions the Rayleigh wave, the Bleustein-Gulyaev wave, and the new transverse mode. We clarify properties of this mode, such as its polarization, dispersion, and speed of sound. While this surface mode cannot be used to carry an electron, it could play an important role when surface acoustic phonons are used as quantum bus to convey information between quantum dots. |
Thursday, March 5, 2020 3:54PM - 4:06PM |
U17.00008: Optimal control of nanomechanical quantum memory coupled to superconducting qubit Mingyu Kang, Zhaoyou Wang, Edward A Wollack, Agnetta Cleland, Rachel Gruenke, Nathan Lee, Kevin Multani, Marek Pechal, Patricio Arrangoiz-Arriola, Amir Safavi-Naeini Quantum memory coupled to a single non-linear element such as superconducting qubit can serve as a promising quantum information processing platform with advantages in lifetime and hardware-efficiency. However, naïve implementation of this quantum computing architecture requires two additional SWAP gates between the memory resonator and the processing qubit per each gate operation, which can cause longer gate time and larger error. In this work we explore the optimal control for performing high-fidelity state preparation and unitary gates on quantum memory by using a power- and bandwidth-limited pulse optimization method. Specifically, we apply our method to a hybrid system of nanomechanical resonators coupled to tunable-frequency transmon qubit and find the optimal pulse for generating entangled states of mechanical resonators as well as implementing phonon-phonon CNOT gate. We test the pulse's robustness to experimental imperfections, such as pulse noise, parameter uncertainties, and decoherence. Finally, we find the optimal pulse length and gate fidelity as a function of the qubit-resonator coupling strength and frequency spacing of resonators, suggesting the experimental parameter regime for achieving scalable quantum computing. |
Thursday, March 5, 2020 4:06PM - 4:18PM |
U17.00009: Synthesizing multi-phonon quantum superposition states using three-body interactions with transmon qubits Marios Kounalakis, Yaroslav M. Blanter, Gary Steele We propose a scheme for controlling a radio-frequency mechanical resonator at the quantum scale using two superconducting transmon qubits. The qubits are coupled via a capacitor in parallel to a superconducting quantum interference device (SQUID), which has a suspended mechanical beam embedded in one of its arms. Following a theoretical analysis of the quantum system, we find that this configuration, in combination with an in-plane magnetic field, can give rise to a tuneable three-body interaction in the single-photon strong-coupling regime, while enabling suppression of the stray qubit-qubit coupling. Using state-of-the-art parameters and qubit operations at single-excitation levels, we numerically demonstrate the possibility of ground-state cooling as well as high-fidelity preparation of multi-phonon quantum states and qubit-phonon entanglement. Our work significantly extends the quantum control toolbox of radio-frequency mechanical resonators and may serve as a promising architecture for integrating such mechanical elements with transmon-based quantum processors. |
Thursday, March 5, 2020 4:18PM - 4:30PM |
U17.00010: Nonclassical energy squeezing with quadratic electromechanics Xizheng Ma, Jeremie Viennot, Shlomi Kotler, John Teufel, Konrad Lehnert The ability to access a broad range of quantum state of motion with massive mechanical oscillators has been an enduring ambition in the field of opto- and electromechanics. Despite achieving many landmarks, the often exploited radiation pressure coupling between these |
Thursday, March 5, 2020 4:30PM - 4:42PM |
U17.00011: Computing with Quantum Analogues Keith Runge, M. Arif Hasan, Lazaro Calderin, Trevor Lata, Pierre Lucas, Pierre A. Deymier Recent progress in the design and realization of phononic structures has resulted in a number of quantum analogues.1 Elastic waves in one-dimensional waveguides with broken time-reversal or parity symmetry obey Dirac-like equations and possess spin-like topology.2 Of particular interest for quantum computing is the design, construction, and demonstration of coherent superpositions of elastic waves in waveguides and coupled waveguides.3 These coherent superpositions can be characterized by the phase of the elastic wavefunction and are called phase-bits or phi-bits. The construction of non-separable (i.e., ‘classically entangled’) superpositions has been achieved using phi-bits comprised of coupled waveguides.4 These phononic structures allows accessing quantum analogue computing at room temperatures and long coherence times. |
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