William Strickland

Feb 10, 2025 | link.aps.org | William Strickland |Bassel Heiba Elfeky |Lukas Baker |Andrea Maiani

Fluxonium qubits are a promising alternative to the conventional transmon for quantum computation using superconducting circuits. The two lowest-energy wave functions are localized, distinct wells in phase space, leading to a suppressed transition-matrix element and longer bit-flip times. There also exists a magnetic flux “sweet spot,” where the qubit frequency is first-order insensitive to flux noise. However, the exact qubit characteristics depend on the exact circuit parameters.

Feb 10, 2025 | journals.aps.org | William Strickland |Bassel Heiba Elfeky |Lukas Baker |Andrea Maiani

Fluxonium qubits are a promising alternative to the conventional transmon for quantum computation using superconducting circuits. The two lowest-energy wave functions are localized, distinct wells in phase space, leading to a suppressed transition-matrix element and longer bit-flip times. There also exists a magnetic flux “sweet spot,” where the qubit frequency is first-order insensitive to flux noise. However, the exact qubit characteristics depend on the exact circuit parameters.

Apr 25, 2024 | link.aps.org | William Strickland |Lukas Baker |Jaewoo Lee |Krishna Dindial

The tunneling of Cooper pairs across a Josephson junction (JJ) allows for the nonlinear inductance necessary to construct superconducting qubits, amplifiers, and various other quantum circuits. An alternative approach using hybrid superconductor-semiconductor JJs can enable superconducting qubit architectures with all electric control. Here we present continuous-wave and time-domain characterization of gatemon qubits and coplanar waveguide resonators based on an InAs two-dimensional electron gas.

Sep 22, 2023 | link.aps.org | Bassel Heiba Elfeky |William Strickland |Jaewoo Lee |James T. Farmer

Popular Summary Standard Josephson tunnel junctions, formed by two superconducting layers sandwiching a nm-thick insulating barrier, conduct current through the tunneling of Cooper pairs. Current in a Josephson junction based on indium arsenide, however, is carried by coherent reflections of normal electrons and holes at the two interfaces forming Andreev bound states.