High-fidelity dissipative stabilization of multipartite entanglement

Abstract

Quantum reservoir engineering allows autonomous preparation and stabilization of entangled states in a quantum system, where carefully chosen always-on interactions with an auxiliary bath steer the system to the desired state. States prepared this way are stable over indefinitely long time intervals and robust to decoherence, in contrast to states prepared using typical gate-based methods. To date, dissipative stabilization of few-qubit Bell, W, and GHZ states has been demonstrated in a variety of quantum information processing platforms. Recent works have highlighted the importance of “exact” stabilization [1,2], which we expect to become increasingly important when preparing larger and more complex states with high fidelity. In this talk, We will introduce a platform-agnostic family of exact stabilization protocols that prepare entangled states of arbitrarily many qubits in a resource-efficient manner. We will motivate and discuss the design rules underlying the protocol, and show how the stabilization performance scales as the number of qubits is increased. [1] T. Brown, E. Doucet, et al, arXiv:2107.13579 (2021) [2] E. Doucet, et al, Phys. Rev. Research 2, 023370 (2020) *This work was supported by the QISE-NET fellowship program and AFOSR grant FA9550-21-1-0151.