Abstract:
Superfluids of exciton-polaritons may form circular currents characterised by discrete opological charges. Superpositions of superfluid states having different topological charges may be used to build qubits conceptually similar to superconducting phase qubits [1]. We demonstrate a full set of single qubit gate operations and an entangling double qubit gate operation with such states. I discuss their quantumness in terms of the negativity of a double-qubit density matrix and perspectives for the violation of the Bell inequality.
[1] "Polariton lasers for classical and quantum computing", A.V. Kavokin, T.C.H. Liew, S. Klembt, P.G. Lagoudakis and S. Hoefling, Nature Reviews Physics, 4, 435–451 (2022).
Seminar by the NYU-ECNU Institute of Physics at NYU Shanghai