Towards driven-dissipative remote entanglement between cascaded superconducting qubits (Part-I: Theory and Setup)

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-I of this talk, we review the theory behind this protocol, explaining how the degree of entanglement of the steady state varies with physical parameters such as transmission line loss, qubit coherence times, and qubit-waveguide couplings. We calculate the expectation value of an entanglement witness to predict a lower bound on the concurrence of the entangled steady state. We find that entanglement stabilization is within reach in a network of remote superconducting circuits.

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

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