Quantum Gates

Tunable coupler enabling two-qubit gates approaching 99.9% fidelity

Quantum Optics

Engineering quantum interference to protect giant artificial atoms coupled to open waveguides

Quantum Engineering

24-pin package routing input/output signals that control a quantum processor

Quantum-Limited Amplifiers

Near-quantum-limited traveling wave parametric amplifiers (TWPAs)

Quantum Workforce

Vibrant team of post docs, graduate students, and undergraduate researchers

Quantum Hollywood Squares

High-connectivity in the age of online group meetings

Quantum Circuits

Integrated quantum circuits fabricated on 200 mm silicon wafers

Quantum Control

Controlling quantum systems with microwave pulses

Quantum Interference

Landau-Zener-Stueckelberg quantum interference realized with superconducting qubits.

Quantum Systems

Engineering physics in the pursuit of coherent quantum systems and extensible technologies

Mission:

We are a diverse team of physicists and engineers working together to understand, design, manufacture, and control coherent quantum systems comprising superconducting artificial atoms (qubits) for quantum information science and technology applications. Our efforts span fundamental research to applied physics and systems engineering.

Recent News:

1/21/2022 – Ben, Antti, and Cole’s manuscript “Deep-Neural-Network Discrimination of Multiplexed Superconducting-Qubit States” published in Physical Review Applied

1/18/2022 – Chris, Charles, and Michael’s manuscript, “Twist: sound reasoning for purity and entanglement in quantum programs” published in Proceedings of the ACM on Programming Languages

1/7/2022 – Morten, Mollie, Ami, and Gabriel’s manuscript “Demonstration of Density Matrix Exponentiation Using a Superconducting Quantum Processor” published in Physical Review X

12/23/2021 – Holiday Greetings from EQuS

12/23/2021 – Jochen, Amir, Yariv, and collaborators’ manuscript published in Nature Physics

Recent Publications:

Deep neural network discrimination of multiplexed superconducting qubit states
B. Lienhard, A. Vepsäläinen, L. C. G. Govia, C. R. Hoffer, J. Y. Qiu, D. Ristè, M. Ware, D. Kim, R. Winik, A. Melville, B. Niedzielski, J. Yoder, G. J. Ribeill, T. A. Ohki, H. K. Krovi, T. P. Orlando, S. Gustavsson, W. D. Oliver
Phys. Rev. Applied 17, 014024 (2022) | arXiv:2102.12481 (2021)

Twist: sound reasoning for purity and entanglement in Quantum programs
C. Yuan, C. McNally, M. Carbin
Proc. ACM Program. Lang. 6, POPL, Article 30, 1-32 (2022)

Demonstration of Density Matrix Exponentiation using a superconducting quantum processor
M. Kjaergaard, M. E. Schwartz, A. Greene, G. O. Samach, A. Bengtsson, M. O’Keeffe, C. M. McNally, J. Braumüller, D. K. Kim, P. Krantz, M. Marvian, A. Melville, B. M. Niedzielski, Y. Sung, R. Winik, J. L. Yoder, D. Rosenberg, K. Obenland, S. Lloyd, T. P. Orlando, I. Marvian, S. Gustavsson, W. D. Oliver
Phys. Rev. X 12, 011005 (2022) | arXiv:2001.08838 (2020)

Probing quantum information propagation with out-of-time-ordered correlators
J. Braumüller, A. H. Karamlou, Y. Yanay, B. Kannan, D. Kim, M. Kjaergaard, A. Melville, B. M. Niedzielski, Y. Sung, A. Vepsäläinen, R. Winik, J. L. Yoder, T. P. Orlando, S. Gustavsson, C. Tahan, W. D. Oliver
Nat. Phys. (2021) | arXiv:2102.11751 (2021)
See also: News and Views by Arghavan Safavi–Naini

Quantum computing for business leaders
J. Ruane, A. McAfee, W. D. Oliver
Harvard Business Review, January-February (2022)