Split-ring polariton condensates as macroscopic two-level quantum systems

Superposition states of circular currents exciton-polaritons mimic the superconducting flux qubits. The phase a polariton fluid must change by an integer number $2\pi$, when going around ring. If one introduces ${\pi}$-phase delay line in ring, is obliged to propagate clockwise or anticlockwise current reduce total gained over round-trip zero build it up $2\pi$. We show that such $\pi$-delay can be provided dark soliton pinned potential well created C-shape non-resonant pump-spot. resulting split-ring condensates exhibit pronounced coherent oscillations passing periodically through and states. These may persist far beyond coherence time condensates. qubits based on are expected possess very high figures merit makes them valuable alternative use dipole-polarized polaritons allows control coherently state qubit with external electric field. This shown tools for realization single-qubit logic operations. propose design $i$SWAP gate pair coupled To demonstrate capacity platform quantum computations, we protocol Deutsch's algorithm networks.