Title:
Building protective superconducting qubits with granular Al superinductors
Building protective superconducting qubits with granular Al superinductors
Time:
05/08 (Sat.) 6 pm PDT, 7 pm MDT, 8 pm CDT, 9 pm EDT
05/09 (Sun.) 3 am CEST, 9 am Taiwan
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05/08 (Sat.) 6 pm PDT, 7 pm MDT, 8 pm CDT, 9 pm EDT
05/09 (Sun.) 3 am CEST, 9 am Taiwan
Time zone conversion tool
Keywords:
physics, condensed matter physics, superconducting qubits, cryogenic microwave circuits
physics, condensed matter physics, superconducting qubits, cryogenic microwave circuits
Abstract:
Superinductors are an essential element of a novel qubit that we developed – the so-called bifluxon. The qubit consists of a superconducting loop formed by a Cooper-pair box (CPB) with low-E_J Josephson junctions shunted by a superinductor based on the granular Aluminum films, in which low-E_J Josephson junctions are realized between nanoscale grains. When the qubit loop is threaded by the magnetic flux Φ=Φ_0/2 (Φ_0 is the flux quantum), the bifluxon offers exponential suppression of energy decay from charge and flux noises, and dephasing from flux noise. We observed an increase of the energy relaxation time by two orders of magnitude, up to 100μs, by turning on the protection. In this talk I will discuss the general idea for building a protective superconducting qubit and dive into the experimental realization of superinductors and protective superconducting circuits.
Superinductors are an essential element of a novel qubit that we developed – the so-called bifluxon. The qubit consists of a superconducting loop formed by a Cooper-pair box (CPB) with low-E_J Josephson junctions shunted by a superinductor based on the granular Aluminum films, in which low-E_J Josephson junctions are realized between nanoscale grains. When the qubit loop is threaded by the magnetic flux Φ=Φ_0/2 (Φ_0 is the flux quantum), the bifluxon offers exponential suppression of energy decay from charge and flux noises, and dephasing from flux noise. We observed an increase of the energy relaxation time by two orders of magnitude, up to 100μs, by turning on the protection. In this talk I will discuss the general idea for building a protective superconducting qubit and dive into the experimental realization of superinductors and protective superconducting circuits.
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