Gangqiang Liu
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View article: Optimizing the pump coupling for a three-wave-mixing Josephson parametric amplifier
Optimizing the pump coupling for a three-wave-mixing Josephson parametric amplifier Open
Josephson element-based parametric amplifiers (JPAs) typically require rf pump power that is several orders of magnitude stronger than the maximum signal power they can handle. The low power efficiency and strong pump leakage towards signa…
View article: Efficient Fabrication of Disordered Graphene with Improved Ion Accessibility, Ion Conductivity, and Density for High‐Performance Compact Capacitive Energy Storage
Efficient Fabrication of Disordered Graphene with Improved Ion Accessibility, Ion Conductivity, and Density for High‐Performance Compact Capacitive Energy Storage Open
High‐performance compact capacitive energy storage is vital for many modern application fields, including grid power buffers, electric vehicles, and portable electronics. However, achieving exceptional volumetric performance in supercapaci…
View article: Engineering a multi-level bath for transmons with three-wave mixing and parametric drives
Engineering a multi-level bath for transmons with three-wave mixing and parametric drives Open
A quantum system with a tunable bath temperature provides an additional degree of freedom for quantum simulators. Such a system can be realized by parametrically modulating the coupling between the system and the bath. Here, by coupling a …
View article: Demonstrating a superconducting dual-rail cavity qubit with erasure-detected logical measurements
Demonstrating a superconducting dual-rail cavity qubit with erasure-detected logical measurements Open
A critical challenge in developing scalable error-corrected quantum systems is the accumulation of errors while performing operations and measurements. One promising approach is to design a system where errors can be detected and converted…
View article: Fully Directional Quantum-limited Phase-Preserving Amplifier
Fully Directional Quantum-limited Phase-Preserving Amplifier Open
We present a way to achieve fully directional, quantum-limited phase-preserving amplification in a four-port, four-mode superconducting Josephson circuit by utilizing interference between six parametric processes that couple all four modes…
View article: Bubble Up Induced Graphene Microspheres for Engineering Capacitive Energy Storage (Adv. Energy Mater. 16/2023)
Bubble Up Induced Graphene Microspheres for Engineering Capacitive Energy Storage (Adv. Energy Mater. 16/2023) Open
Supercapacitors Translating the materials metrics of graphene into supercapacitor performance is critical but engineering capacitive energy storage is challenging. In article number 2203761, Jinyou Shao and co-workers introduce a bubble-in…
View article: Magnetic Field-Resilient Quantum-Limited Parametric Amplifier
Magnetic Field-Resilient Quantum-Limited Parametric Amplifier Open
Superconducting parametric amplifiers are crucial components in microwave quantum circuits for\nenabling quantum-limited signal readout. The best-performing such amplifiers are often based on Josephson junctions, which however are sensitiv…
View article: Magnetic field-resilient quantum-limited parametric amplifier
Magnetic field-resilient quantum-limited parametric amplifier Open
Superconducting parametric amplifiers are crucial components in microwave quantum circuits for enabling quantum-limited signal readout. The best-performing such amplifiers are often based on Josephson junctions, which however are sensitive…
View article: Josephson Array Mode Parametric Amplifier
Josephson Array Mode Parametric Amplifier Open
We introduce a novel near-quantum-limited amplifier with a large tunable bandwidth and high dynamic range - the Josephson Array Mode Parametric Amplifier (JAMPA). The signal and idler modes involved in the amplification process are realize…
View article: Erratum: Bose-Einstein Condensation of Long-Lifetime Polaritons in Thermal Equilibrium [Phys. Rev. Lett. <b>118</b>, 016602 (2017)]
Erratum: Bose-Einstein Condensation of Long-Lifetime Polaritons in Thermal Equilibrium [Phys. Rev. Lett. <b>118</b>, 016602 (2017)] Open
This corrects the article DOI: 10.1103/PhysRevLett.118.016602.
View article: Josephson parametric converter saturation and higher order effects
Josephson parametric converter saturation and higher order effects Open
Microwave parametric amplifiers based on Josephson junctions have become a key component of many quantum information experiments. One key limitation which has not been well predicted by theory is the gain saturation behavior which determin…
View article: Bose-Einstein Condensation of Long-Lifetime Polaritons in Thermal Equilibrium
Bose-Einstein Condensation of Long-Lifetime Polaritons in Thermal Equilibrium Open
The experimental realization of Bose-Einstein condensation (BEC) with atoms and quasiparticles has triggered wide exploration of macroscopic quantum effects. Microcavity polaritons are of particular interest because quantum phenomena such …