Driven-dissipative remote entanglement for superconducting qubits (Part II): General Strategies

Remote entanglement is a fundamental resource for a variety of tasks in quantum information processing; there is thus immense interest in methods for dissipatively preparing and stabilizing such states. While there is considerable work on stabilizing just a single entangled pair of qubits, the potential for stabilizing larger entangled states also exists. Here, we build on the results presented in Part I of this talk, and discuss more general (but nonetheless realistic) strategies for dissipative entanglement stabilization of large numbers of remote qubits, including schemes that do not require any sort of directional interaction. By exploiting subtle symmetry properties, we show that a variety of multi-qubit entangled states can be stabilized, using minimal resources (e.g. correlated loss from a waveguide, local driving, and passive XY couplings). We also discuss the robustness of our schemes to various kinds of imperfections. Our ideas are compatible with superconducting circuit architectures, as well as other experimental platforms (e.g. trapped ions).