Towards driven-dissipative remote entanglement between cascaded superconducting qubits (Part-II: Experiment)

Stabilizing entanglement between qubits using quantum reservoir engineering is an interesting problem from a fundamental and practical point of view. In this talk we discuss a superconducting circuit implementation of a stabilization protocol based on a cascaded system of driven qubits coupled to a chiral transmission line. The steady state of this open system is independent of the distance between the qubits [1, 2]. In Part-II of this talk, we present a low-loss prototype network to realize this driven-dissipative remote entanglement (DDRE) protocol. Our setup consists of two transmon qubit devices connected by a low-loss transmission line and a microwave circulator. We experimentally characterize the loss properties of the qubits and the network and establish the feasibility of measuring steady-state entanglement. We find that DDRE is within reach and discuss proof-of-concept demonstrations along with how higher fidelity entanglement can be achieved in the future.

[1]: K Stannigel et al 2012 New J. Phys

[2]: Motzoi et al 2016 Phy. Rev. A