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Photon Pair Condensation by Engineered Dissipation

TitlePhoton Pair Condensation by Engineered Dissipation
Publication TypeJournal Article
Year of Publication2019
AuthorsZ-P. Cian, G. Zhu, S-K. Chu, A. Seif, W. DeGottardi, L. Jiang, and M. Hafezi
JournalPhys. Rev. Lett.
Date PublishedAUG 6
Type of ArticleArticle

Dissipation can usually induce detrimental decoherence in a quantum system. However, engineered dissipation can be used to prepare and stabilize coherent quantum many-body states. Here, we show that, by engineering dissipators containing photon pair operators, one can stabilize an exotic dark state, which is a condensate of photon pairs with a phase-nematic order. In this system, the usual superfluid order parameter, i.e., single-photon correlation, is absent, while the photon pair correlation exhibits long-range order. Although the dark state is not unique due to multiple parity sectors, we devise an additional type of dissipators to stabilize the dark state in a particular parity sector via a diffusive annihilation process which obeys Glauber dynamics in an Ising model. Furthermore, we propose an implementation of these photon pair dissipators in circuit-QED architecture.