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 A10: Hybrid Superconducting Quantum CircuitsInvited Live
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Sponsoring Units: DQI Chair: Javad Shabani, New York Univ NYU |
Monday, March 15, 2021 8:00AM - 8:36AM Live |
A10.00001: 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 4Pi-periodic Andreev levels, signifying the presence of topological superconductivity and Majorana end modes. |
Monday, March 15, 2021 8:36AM - 9:12AM Live |
A10.00002: 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. We have demonstrated superconducting transmon qubits with Josephson junctions based on hybrid superconductor-semiconductor 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 [3]. |
Monday, March 15, 2021 9:12AM - 9:48AM Live |
A10.00003: 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 15, 2021 9:48AM - 10:24AM Live |
A10.00004: Magnetic-field-compatible hybrid superconducting circuits Invited Speaker: Angela Kou
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Monday, March 15, 2021 10:24AM - 11:00AM Live |
A10.00005: Coherent control of a hybrid superconducting circuit made with van der Waals heterostructures Invited Speaker: William Oliver In this talk, we present the demonstration of a superconducting transmon qubit realized using a graphene-based weak-link junction. The graphene is encapsulated by hexagonal Boron Nitride (hBN), forming a van der Waals heterostructure. Applying a voltage to a backgate in proximity to the weak-link junction enables voltage tunability of the qubit frequency. We present the coherent control of this qubit, and discuss the promise and the challenges if building superconducting qubits with such van der Waals heterostructures. |
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