Robert Schoelkopf

· Sterling Professor of Applied Physics and Professor of Physics

Yale University · Aeronautics and Astronautics

Active 1993–2024

h-index83

Citations39.2k

Papers40973 last 5y

Funding$1.0M

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About

Robert Schoelkopf is a Sterling Professor of Applied Physics and a Professor of Physics at Yale University. His professional address is 15 Prospect St, New Haven, CT 06511-6816. As a distinguished member of the Yale Center for Astronomy and Astrophysics, he is recognized for his contributions to the fields of applied physics and physics. The information provided emphasizes his academic titles and affiliation with Yale University, but does not include specific details about his research focus, background, or key contributions.

Research topics

Physics
Quantum mechanics
Computer Science
Mathematics
Algorithm
Statistical physics

Selected publications

Real-time quantum error correction beyond break-even
Nature · 2023 · 384 citations
- Computer Science
- Computer Science
- Quantum mechanics
DOI
The squeezed Kerr oscillator: spectral kissing and phase-flip robustness
arXiv (Cornell University) · 2022 · 20 citations
- Physics
- Quantum mechanics
- Mathematics
By applying a microwave drive to a specially designed Josephson circuit, we have realized an elementary quantum optics model, the squeezed Kerr oscillator. This model displays, as the squeezing amplitude is increased, a cross-over from a single ground state regime to a doubly-degenerate ground state regime. In the latter case, the ground state manifold is spanned by Schrödinger-cat states, i.e. quantum superpositions of coherent states with opposite phases. For the first time, having resolved up to the tenth excited state in a spectroscopic experiment, we confirm that the proposed emergent static effective Hamiltonian correctly describes the system, despite its driven character. We also find that the lifetime of the coherent state components of the cat states increases in steps as a function of the squeezing amplitude. We interpret the staircase pattern as resulting from pairwise level kissing in the excited state spectrum. Considering the Kerr-cat qubit encoded in this ground state manifold, we achieve for the first time quantum nondemolition readout fidelities greater than 99%, and enhancement of the phase-flip lifetime by more than two orders of magnitude, while retaining universal quantum control. Our experiment illustrates the crucial role of parametric drive Hamiltonian engineering for hardware-efficient quantum computation.
Publisher OA PDF DOI
Fast universal control of an oscillator with weak dispersive coupling to a qubit
Nature Physics · 2022 · 164 citations
- Physics
- Quantum mechanics
DOI