Quantum trajectories of superconducting qubits

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• 作者：Steven J. Weber^a ; ^{Steven.Weber@ll.mit.edu" class="auth_mail" title="E-mail the corresponding author} ; Kater W. Murch^b ; Mollie E. Kimchi-Schwartz^a ; Nicolas Roch^c ; Irfan Siddiqi^a
• 关键词：Quantum measurement ; Quantum information processing ; Microwave quantum optics ; Superconducting qubits ; Parametric amplifiers
• 刊名：Comptes Rendus Physique
• 出版年：2016
• 出版时间：August-September 2016
• 年：2016
• 卷：17
• 期：7
• 页码：766-777
• 全文大小：756 K

文摘

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.