|Title||Photon Pair Condensation by Engineered Dissipation|
|Publication Type||Journal Article|
|Year of Publication||2019|
|Authors||Z-P. Cian, G. Zhu, S-K. Chu, A. Seif, W. DeGottardi, L. Jiang, and M. Hafezi|
|Journal||Phys. Rev. Lett.|
|Date Published||AUG 6|
|Type of Article||Article|
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.