Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session L30: Multi-Mode and 3D Cavity Circuit QED Systems IFocus Live
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Sponsoring Units: DQI Chair: Ravi Naik, Univ of California – Berkeley |
Wednesday, March 17, 2021 8:00AM - 8:12AM Live |
L30.00001: Sub-wavelength addressing of superconducting qubits in a rectangular waveguide Romain Albert, Eric Rosenthal, Maximilian Zanner, Silvia Casulleras, Mathieu L. Juan, Konrad Lehnert, Oriol Romero-Isart, Gerhard Kirchmair Superconducting qubits coupled to microwave waveguides are a promising platform for quantum simulation. The combination of direct qubit interaction and the coupling to an open quantum system allows for a wide variety of Hamiltonians to be modeled with relatively minimal hardware. However, it can be a challenge to address individual qubits in such systems, as they are often separated by less than the wavelength of their control field. This problem can be overcome by using the non-linear dispersion of a rectangular waveguide near its cutoff frequency to self-focus a microwave pulse at a highly resolved location within the waveguide. Furthermore, such a pulse can be used to selectively control a qubit[1]. We experimentally demonstrate this control using transmon qubits embedded in a rectangular waveguide. |
Wednesday, March 17, 2021 8:12AM - 8:24AM Live |
L30.00002: State preparation and tomography in 3D multimode circuit QED Kevin He, Srivatsan Chakram, Akash Dixit, Andrew Oriani, Ravi K. Naik, Nelson Leung, Hyeokshin Kwon, Riju Banerjee, Wen-Long Ma, Liang Jiang, David I Schuster Multimode cavity quantum electrodynamics, where a two level system interacts simultaneously with many cavity modes, provides a versatile framework for quantum information processing and quantum optics. One platform for realizing this involves coupling a transmon circuit to a multimode superconducting microwave cavity, offering a combination of high coherences and strong interactions. Our implementation of such a multimode processor uses the quantum flute: a seamless rectangular 3D multimode cavity with a tailored mode dispersion, ~2 ms decay times, and single-photon cooperativities ~1 billion for 9 distinct modes. We present ways to take advantage of the nonlinearity of a single transmon circuit for universal control of all the cavity modes. These include quantum optimal control pulses that utilize photon number dependent phase shifts, and Hilbert space engineering with photon blockade. We use these schemes to prepare Fock states of increasing photon number in any mode and multimode entangled states. We also present a novel, general scheme for multimode Wigner tomography that does not require engineering of the dispersive shift, or the use of higher transmon levels. |
Wednesday, March 17, 2021 8:24AM - 8:36AM Live |
L30.00003: Multiplexed stabilization of cat qubits Connor Hann, Patricio Arrangoiz-Arriola, Kyungjoo Noh, Amir Safavi-Naeini, Liang Jiang, Fernando Brandao Stabilized cat qubits have recently attracted interest due to their tunable noise bias, a property which can be exploited to improve error correction thresholds and reduce fault-tolerance overhead. Cat qubits have been realized in circuit QED experiments, where nonlinear circuit elements facilitate the driven-dissipative processes that stabilize the cat states. In order to scale up a cat-qubit architecture, it will be crucial to stabilize and couple multiple cat qubits in a way that both maximizes connectivity and minimizes crosstalk. In this talk, I will show how multiple cat qubits can be simultaneously stabilized by a single, shared nonlinear element, enabling increased connectivity and hardware efficiency. Moreover, I will discuss the sources of crosstalk in such architectures and show how the dominant sources can be effectively suppressed via filtering. |
Wednesday, March 17, 2021 8:36AM - 9:12AM Live |
L30.00004: Quantum error correction of a qubit encoded in grid states of an oscillator Invited Speaker: Phillipe Campagne-Ibarcq In 2001, Gottesman, Kitaev and Preskill (GKP) proposed to encode a fully correctable logical qubit in grid states of a single harmonic oscillator. Although this code was originally designed to correct against shift errors, GKP qubits are robust against virtually all realistic error channels. Since this proposal, other bosonic codes have been extensively investigated, but only recently were the exotic GKP states experimentally synthesized and stabilized. These experiments relied on stroboscopic interactions between a target oscillator and an ancillary two-level system to measure non-destructively the GKP code error syndromes. |
Wednesday, March 17, 2021 9:12AM - 9:24AM Live |
L30.00005: Multilayer Microwave Integrated Quantum Circuits: Part 1 Chan U Lei, Lev Krayzman, Suhas Ganjam, Luigi Frunzio, Robert J Schoelkopf Superconducting quantum circuits provide a promising platform for quantum information processing. Resonant modes found in superconducting enclosures can be engineered to offer superior coherence and a better electromagnetic environment than their planar analogues. Here, we will discuss the Multilayer Microwave Integrated Quantum Circuit (MMIQC). This platform combines the high coherence of 3D superconducting enclosures with the lithographic precision and versatility of existing MMIC (Monolithic Microwave Integrated Circuit) technology to realize quantum modules that are both scalable and highly coherent. In this talk, we will present an overview of the MMIQC architecture and the ability to realize modular quantum networks. |
Wednesday, March 17, 2021 9:24AM - 9:36AM Live |
L30.00006: Multilayer Microwave Integrated Quantum Circuits: Part 2 Lev Krayzman, Chan U Lei, Suhas Ganjam, Luigi Frunzio, Robert J Schoelkopf Superconducting quantum circuits provide a promising platform for quantum information processing. Resonant modes found in superconducting enclosures can be engineered to offer superior coherence and a better electromagnetic environment than their planar analogues. Here, we will discuss the Multilayer Microwave Integrated Quantum Circuit (MMIQC). A crucial component of the MMIQC is the realization of a high quality superconducting enclosure. The ability to make such a component necessitates the production of a high quality superconducting seam. In this talk, we will present an indium bump-bonding approach to produce superconducting seams with RF conductance exceeding 10^10/Ohm/m. |
Wednesday, March 17, 2021 9:36AM - 9:48AM Live |
L30.00007: Multilayer Microwave Integrated Quantum Circuits: Part 3 Suhas Ganjam, Chan U Lei, Lev Krayzman, Luigi Frunzio, Robert J Schoelkopf Superconducting quantum circuits provide a promising platform for quantum information processing. Resonant modes found in superconducting enclosures can be engineered to offer superior coherence and a better electromagnetic environment than their planar analogues. Here, we will discuss the Multilayer Microwave Integrated Quantum Circuit (MMIQC). A crucial component of the MMIQC is the realization of a high quality superconducting enclosure. In this talk, we will demonstrate on-chip microwave resonating cavities with quality factors exceeding 300 million and describe their power and temperature dependence. We will discuss factors that may limit the performance of the cavity by placing bounds on intrinsic loss mechanisms. |
Wednesday, March 17, 2021 9:48AM - 10:00AM Live |
L30.00008: Symmetry-engineered collective dark state in an open quantum system Maximilian Zanner, Tuure Orell, Romain Albert, Christian M. F. Schneider, Stefan Oleschko, Mathieu Juan, Matti Silveri, Gerhard Kirchmair The coherence properties of an atom or superconducting qubit strongly depend on the electromagnetic environment. Typical circuit QED experiments protect the qubit mode from decay into dissipative modes by placing it into a cavity. Effectively, a reduction of the available mode density reduces the free-space spontaneous emission rate of the qubit. In waveguide QED the qubit is strongly coupled to a continuous mode spectrum, thus it decays rapidly. Collective effects between multiple qubits can be utilized to generate subradiant states that decouple from the dissipative waveguide environment. |
Wednesday, March 17, 2021 10:00AM - 10:12AM Live |
L30.00009: Relative Lifetimes of Quantum Information Encoded in Various Quantum Memories Matthew Otten, Keshav Kapoor, A. Baris Ozguler, Eric T Holland, James B. Kowalkowski, Yuri Alexeev, Adam Lyon
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Wednesday, March 17, 2021 10:12AM - 10:24AM Not Participating |
L30.00010: Engineering tunable interactions via parametric flux modulation in 3D - Part I Yao Lu, Aniket Maiti, Suhas Ganjam, Yaxing Zhang, Luigi Frunzio, Steven Girvin, Robert J Schoelkopf Parametric flux modulation of SQUIDs and other flux-tunable devices has shown great promise in engineering fast gate operations and nonlinear quantum interactions. However, its applications have been by far mostly limited to 2D planar architectures. The efficient delivery of fast flux modulation in 3D architectures, potentially allowing the integration of fast parametric interactions with highly coherent 3D quantum memories, has been a tempting yet challenging task. Here we propose a novel design that allows such an efficient delivery of ac flux into a 3D superconducting package without driving the charge degree of freedom, while preserving the coherence properties of the device. As an example, we show how our design enables the parametric modulation of a dc SQUID device, and demonstrate how high fidelity operations can be achieved. |
Wednesday, March 17, 2021 10:24AM - 10:36AM Live |
L30.00011: Engineering tunable interactions via parametric flux modulation in 3D - Part II Aniket Maiti, Yao Lu, Suhas Ganjam, Yaxing Zhang, Luigi Frunzio, Steven Girvin, Robert J Schoelkopf Quantum memories made of 3D superconducting cavities show potential due to their high quality factor and large Hilbert space. In 2D architectures, using parametric flux drives to achieve coherent processes has been shown to be a promising alternative to the usual voltage-driven schemes. Combining the highly coherent 3D memories with fast flux modulation to attain high-fidelity gates is tempting but has remained a challenging task. In this talk, we present the experimental implementation of a novel design that allows efficient delivery of both AC flux and DC flux into a 3D package, without driving the charge degree of freedom. Using this architecture, we flux-drive a DC SQUID enabling a fast photon-swapping interaction between two modes. We extract circuit parameters and show through simulation the potential for a high-fidelity beamsplitting process. We demonstrate the versatility of our design by showing different drive schemes in this package and discuss their potential advantages. |
Wednesday, March 17, 2021 10:36AM - 10:48AM Live |
L30.00012: Advancements in superconducting cavities for 3D CQED systems Andrew Oriani, Srivatsan Chakram, Kevin He, Alexander V Anferov, Akash Dixit, David I Schuster High coherence 3D cavities have allowed for the creation of single and multimode quantum memories and the creation of non-trivial bosonic states that can be stabilized against decay. Scaling the number of accessible modes in these systems will require the creation of cavities with very long coherence times. In this talk we will discuss the adaptation of niobium superconducting RF accelerator cavity processes to cavity designs common to CQED research. This will include outlining our in-house surface treatment processes and their efficacy in reducing dissipative loss. This includes techniques such as UHV annealing, nitrogen surface doping, and surface oxide diffusion to lower conductive and two-level system loss to ensure high coherence at single-photon powers. We will also discuss a pathway for using these cavities to study loss in qubit-cavity systems. |
Wednesday, March 17, 2021 10:48AM - 11:00AM Live |
L30.00013: Bosonic superradiance and subradiance in an array of superconducting transmon devices Tuure Orell, Maximilian Zanner, Aleksei Sharafiev, Stefan Oleschko, Mathieu L. Juan, Romain Albert, Gerhard Kirchmair, Matti Silveri
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