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Counting statistics of microwave photons in circuit QED

TitleCounting statistics of microwave photons in circuit QED
Publication TypeJournal Article
Year of Publication2020
AuthorsK. N. Nesterov, , and M. G. Vavilov
JournalPhys. Rev. A
Volume101
Pagination052321
Date PublishedMAY 13
Type of ArticleArticle
ISSN2469-9926
Abstract

In superconducting circuit architectures for quantum computing, microwave resonators are often used both to isolate qubits from the electromagnetic environment and to facilitate qubit state readout. We analyze the full counting statistics of photons emitted from such driven readout resonators both in and beyond the dispersive approximation. We calculate the overlap between emitted-photon distributions for the two qubit states and explore strategies for its minimization with the purpose of increasing fidelity of intensity-sensitive readout techniques. In the dispersive approximation and at negligible qubit relaxation, both distributions are Poissonian, and the overlap between them can be easily made arbitrarily small. Nondispersive terms of the Hamiltonian generate squeezing and the Purcell decay with the latter effect giving the dominant contribution to the overlap between two distributions.

DOI10.1103/PhysRevA.101.052321