Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session A16: DQI Invited Session: Voltage-Controlled Josephson Junctions in Superconducting Quantum CircuitsInvited
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Sponsoring Units: DQI Chair: Javad Shabani, New York University Room: 201 |
Monday, March 2, 2020 8:00AM - 8:36AM |
A16.00001: Coherent control of a hybrid superconducting circuit made with van der Waals heterostructures Invited Speaker: William Oliver
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Monday, March 2, 2020 8:36AM - 9:12AM |
A16.00002: On-chip microwave spectroscopy of Andreev and Majorana bound states in semiconductor nanowires Invited Speaker: Attila Geresdi The microscopic picture of the Josephson effect, describing the flow of supercurrent through a weak link, is based on the formation of Andreev bound states, localized at the weak link. In narrow gap semiconductors, such as InAs and InSb, the interplay of induced superconductivity with spin-orbit coupling and magnetic field can give rise to 4π-periodic Andreev levels, signifying the presence of topological superconductivity and Majorana end modes. |
Monday, March 2, 2020 9:12AM - 9:48AM |
A16.00003: Magnetic-field-compatible hybrid superconducting circuits Invited Speaker: Angela Kou Hybrid circuits that incorporate semiconducting elements into superconducting circuits have recently provided new insights into mesoscopic superconductivity. Extending the capabilities of hybrid circuits to work in large magnetic fields would enable the investigation and control of spin-polarized and topological phenomena. In this talk, I will discuss our work building a magnetic-field-compatible nanowire-based fluxonium. We in-situ tune the Josephson energy of the fluxonium with an electrostatic gate and demonstrate operation of the fluxonium in magnetic fields up to 1T. We use the fluxonium spectrum to map out the dependence of the Josephson energy of the junction on magnetic field and also use it to observe the φ0-junction effect. Our work demonstrates the utility of hybrid superconducting circuits for exploring mesoscopic physics and paves the way for manipulating Majorana zero modes in these circuits. |
Monday, March 2, 2020 9:48AM - 10:24AM |
A16.00004: A ballistic graphene superconducting microwave circuit Invited Speaker: Gary Steele Josephson junctions are a fundamental component of microwave quantum circuits, such as tunable cavities, qubits and parametric amplifiers. Recently developed encapsulated graphene JJs, with supercurrents extending over micron distance scales, have exciting potential applications as a new building block for quantum circuits. In this talk, I will present our demonstration of a superconducting microwave circuit based on a ballistic graphene Josephson junction. We directly observe a gate-tunable Josephson inductance through the resonance frequency of the device and, using a detailed RF model, we extract this inductance quantitatively. We also observe the microwave losses of the device, and translate this into sub-gap resistances of the junction at μeV energy scales, not accessible in DC measurements. The microwave performance we observe here suggests that graphene Josephson junctions are a feasible platform for implementing coherent quantum circuits. |
Monday, March 2, 2020 10:24AM - 11:00AM |
A16.00005: Coherent Semiconductor-Based Superconducting Quantum Circuits Invited Speaker: Karl Petersson The recent development of semiconductors with epitaxial superconducting Al contacts offers new approaches to realizing coherent superconducting quantum devices. In particular, we have demonstrated superconducting transmon qubits with Josephson junctions based on hybrid superconductor-semiconductor nanowire materials [1-2]. These gate tunable transmons (gatemons) have the potential advantage that they can be readily controlled through local electrostatic gating of the junction element. I will discuss progress in improving coherence times and scalability of gatemon qubits. I will also discuss how these hybrid circuits might be used to realize novel qubits that are intrinsically protected against sources of decoherence. |
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