415 citations · 1.7k across the 15 of their papers we have counts for
15 papers
High-Fidelity, Frequency-Flexible Two-Qubit Fluxonium Gates with a Transmon Coupler
Leon Ding, Max Hays, Youngkyu Sung +16
We propose and demonstrate an architecture for fluxonium-fluxonium two-qubit gates mediated by transmon couplers (FTF, for fluxonium-transmon-fluxonium). Relative to architectures…
On-Demand Directional Microwave Photon Emission Using Waveguide Quantum Electrodynamics
Bharath Kannan, Aziza Almanakly, Youngkyu Sung +16
Routing quantum information between non-local computational nodes is a foundation for extensible networks of quantum processors. Quantum information transfer between arbitrary node…
Broadband Squeezed Microwaves and Amplification with a Josephson Traveling-Wave Parametric Amplifier
Jack Y. Qiu, Arne Grimsmo, Kaidong Peng +16
Squeezing of the electromagnetic vacuum is an essential metrological technique used to reduce quantum noise in applications spanning gravitational wave detection, biological micros…
Hexagonal Boron Nitride (hBN) as a Low-loss Dielectric for Superconducting Quantum Circuits and Qubits
Joel I-J. Wang, Megan A. Yamoah, Qing Li +19
Dielectrics with low loss at microwave frequencies are imperative for high-coherence solid-state quantum computing platforms. We study the dielectric loss of hexagonal boron nitrid…
Improving qubit coherence using closed-loop feedback
Antti Vepsäläinen, Roni Winik, Amir H. Karamlou +11
Superconducting qubits are a promising platform for building a larger-scale quantum processor capable of solving otherwise intractable problems. In order for the processor to reach…
Lindblad Tomography of a Superconducting Quantum Processor
Gabriel O. Samach, Ami Greene, Johannes Borregaard +15
As progress is made towards the first generation of error-corrected quantum computers, robust characterization and validation protocols are required to assess the noise environment…
Probing quantum information propagation with out-of-time-ordered correlators
Jochen Braumüller, Amir H. Karamlou, Yariv Yanay +13
Interacting many-body quantum systems show a rich array of physical phenomena and dynamical properties, but are notoriously difficult to study: they are challenging analytically an…
Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
Youngkyu Sung, Leon Ding, Jochen Braumüller +14
High-fidelity two-qubit gates at scale are a key requirement to realize the full promise of quantum computation and simulation. The advent and use of coupler elements to tunably co…
Engineering Framework for Optimizing Superconducting Qubit Designs
Fei Yan, Youngkyu Sung, Philip Krantz +6
Superconducting quantum technologies require qubit systems whose properties meet several often conflicting requirements, such as long coherence times and high anharmonicity. Here,…
Multi-level Quantum Noise Spectroscopy
Youngkyu Sung, Antti Vepsäläinen, Jochen Braumüller +14
System noise identification is crucial to the engineering of robust quantum systems. Although existing quantum noise spectroscopy (QNS) protocols measure an aggregate amount of noi…
Characterizing and optimizing qubit coherence based on SQUID geometry
Jochen Braumüller, Leon Ding, Antti Vepsäläinen +12
The dominant source of decoherence in contemporary frequency-tunable superconducting qubits is 1/ flux noise. To understand its origin and find ways to minimize its impact, we s…
Programming a quantum computer with quantum instructions
Morten Kjaergaard, Mollie E. Schwartz, Ami Greene +20
The equivalence between the instructions used to define programs and the input data on which the instructions operate is a basic principle of classical computer architectures and p…
Two-qubit spectroscopy of spatiotemporally correlated quantum noise in superconducting qubits
Uwe von Lüpke, Félix Beaudoin, Leigh M. Norris +9
Noise that exhibits significant temporal and spatial correlations across multiple qubits can be especially harmful to both fault-tolerant quantum computation and quantum-enhanced m…
Non-Gaussian noise spectroscopy with a superconducting qubit sensor
Youngkyu Sung, Félix Beaudoin, Leigh M. Norris +9
Accurate characterization of the noise influencing a quantum system of interest has far-reaching implications across quantum science, ranging from microscopic modeling of decoheren…
A tunable coupling scheme for implementing high-fidelity two-qubit gates
Fei Yan, Philip Krantz, Youngkyu Sung +6
The prospect of computational hardware with quantum advantage relies critically on the quality of quantum gate operations. Imperfect two-qubit gates is a major bottleneck for achie…