Physics of Quantum Devices Lab

26/05/2023

https://doi.org/10.1063/5.0143761

06/05/2023

https://arxiv.org/abs/2305.01872

Measuring the losses arising from different materials and interfaces is crucial to improving the coherence of superconducting quantum circuits. Although this has been of interest for a long time, current studies can either only provide bounds to those losses, or require several devices for a complet...

22/09/2022

A merged-element transmon (MET) device based on silicon (Si) fins is proposed, and the first steps to form such a “FinMET” are demonstrated. This new application of fin technology capitalizes on th...

10/09/2022

https://journals.aps.org/prx/abstract/10.1103/PhysRevX.12.031035

Like a surfer riding a wave, a single electron is transported by an acoustic pulse traveling along the surface of a microchip.

26/08/2022

https://www.science.org/doi/10.1126/sciadv.abq1690

Heat flowing upstream: strong driving of a nonlinear circuit enables thermal excitations to flow from cold to hot.

27/07/2022

A fluxonium processor with fast-frequency tunability and individual controls implements high-fidelity single-qubit and two-qubits gates.

12/07/2022

https://aip.scitation.org/doi/10.1063/5.0085467

Electronic systems for qubit control and measurement serve as a bridge between quantum programming language and quantum information processors. With the rapid development of superconducting quantum...

08/07/2022

https://arxiv.org/abs/1801.07904

The duration and fidelity of qubit readout is a critical factor for applications in quantum information processing as it limits the fidelity of algorithms which reuse qubits after measurement or apply feedback based on the measurement result. Here we present fast multiplexed readout of five qubits i...

02/07/2022

https://arxiv.org/abs/2204.13669?fs=e&s=cl

Microwave Kinetic Inductance Detectors (MKIDs) sensitive to light in the ultraviolet to near-infrared wavelengths are superconducting micro-resonators that are capable of measuring photon arrival times to microsecond precision and estimating each photon's energy. The resolving power of non-membrane....

17/05/2022

https://www.science.org/doi/full/10.1126/sciadv.abi6690

Laser-based thermal annealing is demonstrated for high-yield scaling of high-performance superconducting quantum processors.

30/04/2022

https://arxiv.org/abs/2204.02946

Scalable quantum information processing requires that modular gate operations can be executed in parallel. The presence of crosstalk decreases the individual addressability, causing erroneous results during simultaneous operations. For superconducting qubits which operate in the microwave regime, el...

30/04/2022

https://journals.aps.org/prb/abstract/10.1103/PhysRevB.105.144508

We propose a scheme for enhancing the optomechanical coupling between microwave and mechanical resonators by up to seven orders of magnitude to the ultrastrong coupling limit in a circuit optomechanical setting. The tripartite system considered here consists of a Josephson junction Cooper-pair box t...