Physics of Quantum Devices Lab

https://doi.org/10.1063/5.0143761

pubs.aip.org

https://arxiv.org/abs/2305.01872

Microwave loss characterization using multi-mode superconducting resonators 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...

Towards merged-element transmons using silicon fins: The FinMET 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...

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

Generation of a Single-Cycle Acoustic Pulse: A Scalable Solution for Transport in Single-Electron Circuits Like a surfer riding a wave, a single electron is transported by an acoustic pulse traveling along the surface of a microchip.

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

Parametrically enhanced interactions and nonreciprocal bath dynamics in a photon-pressure Kerr amplifier Heat flowing upstream: strong driving of a nonlinear circuit enables thermal excitations to flow from cold to hot.

Fluxonium: An Alternative Qubit Platform for High-Fidelity Operations A fluxonium processor with fast-frequency tunability and individual controls implements high-fidelity single-qubit and two-qubits gates.

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

FPGA-based electronic system for the control and readout of superconducting quantum processors 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...

https://arxiv.org/abs/1801.07904

Rapid high-fidelity multiplexed readout of superconducting qubits 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...

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

Membrane-less phonon trapping and resolution enhancement in optical microwave kinetic inductance detectors 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....

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

High-performance superconducting quantum processors via laser annealing of transmon qubits Laser-based thermal annealing is demonstrated for high-yield scaling of high-performance superconducting quantum processors.

https://arxiv.org/abs/2204.02946

Cancelling microwave crosstalk with fixed-frequency qubits 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...

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

Enhancement of the optomechanical coupling and Kerr nonlinearity using the Josephson capacitance of a Cooper-pair box 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...