Comptes Rendus
no. 7
Quantum trajectories of superconducting qubits
[Trajectoires quantiques de qubits supraconducteurs]
Steven J. Weber1  ; Kater W. Murch2  ; Mollie E. Kimchi-Schwartz1  ; Nicolas Roch3  ; Irfan Siddiqi1
1 Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, CA 94720, USA
2 Department of Physics, Washington University, St. Louis, MO 63130, USA
3 CNRS and Université Grenoble Alpes, Institut Néel, 38042 Grenoble, France
Comptes Rendus. Physique, Volume 17 (2016) no. 7, pp. 766-777.

Dans ce compte rendu, nous présentons des expériences récentes permettant d'observer l'évolution d'un qubit supraconducteur pendant une mesure. Nous couvrons de manière pégagogique le processus de mesure dans le cas où le qubit est couplé dispersivement à une cavité micro-ondes de manière à ce que son état soit encodé dans la phase d'un ton micro-onde sondant la cavité. Un enregistrement étalé dans le temps est utilisé pour reconstruire les trajectoires quantiques individuelles de l'état du qubit, et la précision de ces trajectoires est vérifiée par une tomographie d'état quantique. De plus, nous discutons les ensembles de trajectoires, l'évolution symmétrique par renversement du temps, les trajectoires à deux qubits et les applications potentielles en correction d'erreur quantique basée sur la mesure.

In this review, we discuss recent experiments that investigate how the quantum sate of a superconducting qubit evolves during measurement. We provide a pedagogical overview of the measurement process, when the qubit is dispersively coupled to a microwave frequency cavity, and the qubit state is encoded in the phase of a microwave tone that probes the cavity. A continuous measurement record is used to reconstruct the individual quantum trajectories of the qubit state, and quantum state tomography is performed to verify that the state has been tracked accurately. Furthermore, we discuss ensembles of trajectories, time-symmetric evolution, two-qubit trajectories, and potential applications in measurement-based quantum error correction.

Publié le :
DOI : 10.1016/j.crhy.2016.07.007
Keywords: Quantum measurement, Quantum information processing, Microwave quantum optics, Superconducting qubits, Parametric amplifiers
Mot clés : Mesure quantique, Processus d'information quantique, Optique quantique au régime micro-onde, Qubits supraconducteurs, Amplificateurs paramétriques
Steven J. Weber 1 ; Kater W. Murch 2 ; Mollie E. Kimchi-Schwartz 1 ; Nicolas Roch 3 ; Irfan Siddiqi 1

1 Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, CA 94720, USA
2 Department of Physics, Washington University, St. Louis, MO 63130, USA
3 CNRS and Université Grenoble Alpes, Institut Néel, 38042 Grenoble, France 
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Steven J. Weber; Kater W. Murch; Mollie E. Kimchi-Schwartz; Nicolas Roch; Irfan Siddiqi. Quantum trajectories of superconducting qubits. Comptes Rendus. Physique, Volume 17 (2016) no. 7, pp. 766-777. doi : 10.1016/j.crhy.2016.07.007. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2016.07.007/

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