Peter Groszkowski
Northwestern University
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Publication
Featured researches published by Peter Groszkowski.
Nature Communications | 2017
Ravi Naik; Nelson Leung; Srivatsan Chakram; Peter Groszkowski; Yao Lu; Nathan Earnest; D. C. McKay; Jens Koch; David Schuster
Qubit connectivity is an important property of a quantum processor, with an ideal processor having random access—the ability of arbitrary qubit pairs to interact directly. This a challenge with superconducting circuits, as state-of-the-art architectures rely on only nearest-neighbor coupling. Here, we implement a random access superconducting quantum information processor, demonstrating universal operations on a nine-qubit memory, with a Josephson junction transmon circuit serving as the central processor. The quantum memory uses the eigenmodes of a linear array of coupled superconducting resonators. We selectively stimulate vacuum Rabi oscillations between the transmon and individual eigenmodes through parametric flux modulation of the transmon frequency. Utilizing these oscillations, we perform a universal set of quantum gates on 38 arbitrary pairs of modes and prepare multimode entangled states, all using only two control lines. We thus achieve hardware-efficient random access multi-qubit control in an architecture compatible with long-lived microwave cavity-based quantum memories.Despite their versatility, superconducting qubits such as transmons still have limited coherence times compared to resonators. Here, the authors show how to use a single transmon to implement universal one-qubit and two-qubit operations among nine qubits encoded in superconducting resonators’ eigenmodes.
New Journal of Physics | 2018
Peter Groszkowski; A. Di Paolo; Arne L. Grimsmo; Alexandre Blais; David Schuster; Andrew Houck; Jens Koch
Superconducting circuits rank among some of the most interesting architectures for the implementation of quantum information processing devices. The recently proposed 0-π qubit (Brooks et al 2013 Phys. Rev. A 87 52306) promises increased protection from spontaneous relaxation and dephasing. In this paper we present a detailed theoretical study of the coherence properties of the 0-π device, investigate relevant decoherence channels, and show estimates for achievable coherence times in multiple parameter regimes. In our analysis, we include disorder in circuit parameters, which results in the coupling of the qubit to a low-energy, spurious harmonic mode. We analyze the effects of such coupling on decoherence, in particular dephasing due to photon shot noise, and outline how such a noise channel can be mitigated by appropriate parameter choices. In the end we find that the 0-π qubit performs well and may become an attractive candidate for the implementation of the next-generation superconducting devices for uses in quantum computing and information.
Nature Communications | 2018
Ravi Naik; Nelson Leung; Srivatsan Chakram; Peter Groszkowski; Yao Lu; Nathan Earnest; D. C. McKay; Jens Koch; David Schuster
In the original version of this Article, the affiliation details for Peter Groszkowski and Jens Koch were incorrectly given as ‘Department of Physics, University of Chicago, Chicago, IL, 60637, USA’, instead of the correct ‘Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA’. This has now been corrected in both the PDF and HTML versions of the Article.
Physical Review Letters | 2017
Yao Lu; Srivatsan Chakram; Nelson Leung; Nathan Earnest; Ravi Naik; Ziwen Huang; Peter Groszkowski; Eliot Kapit; Jens Koch; David Schuster
arXiv: Quantum Physics | 2018
Andrei Vrajitoarea; Ziwen Huang; Peter Groszkowski; Jens Koch; Andrew Houck
Bulletin of the American Physical Society | 2018
Andrei Vrajitoarea; Ziwen Huang; Peter Groszkowski; Jens Koch; Andrew Houck
Bulletin of the American Physical Society | 2018
Peter Groszkowski; Srivatsan Chakram; Ravi Naik; Nelson Leung; Yao Lu; David Schuster; Jens Koch
Bulletin of the American Physical Society | 2018
Agustin Di Paolo; Peter Groszkowski; Arne L. Grimsmo; Andras Gyenis; Andrew Houck; Jens Koch; Alexandre Blais
Bulletin of the American Physical Society | 2018
Ravi Naik; Srivatsan Chakram; Akash Dixit; Nelson Leung; Yao Lu; Nathan Earnest; Carolyn Zhang; Peter Groszkowski; David McKay; Jens Koch; David Schuster
Bulletin of the American Physical Society | 2018
Andras Gyenis; Thomas M. Hazard; Andrei Vrajitoarea; Agustin Di Paolo; Peter Groszkowski; Alexandre Blais; Jens Koch; Andrew Houck