TY - JOUR T1 - Photon pair condensation by engineered dissipation Y1 - 2019 A1 - Ze-Pei Cian A1 - Guanyu Zhu A1 - Su-Kuan Chu A1 - Alireza Seif A1 - Wade DeGottardi A1 - Liang Jiang A1 - Mohammad Hafezi AB -

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. 

UR - https://arxiv.org/abs/1904.00016 ER -