Abstract:

Polariton lasers are semiconductor light-emitting devices based on the bosonic condensation of half-light-half-matter quasiparticles: exciton-polaritons. Due to the stimulated scattering to one or several quantum states, exciton-polaritons form bosonic condensates characterized by high spatial coherence and superfluid properties. Exciting coherent superpositions of pairs of eigen states of polariton superfluids in elliptical traps we create qubits characterized by very slow decoherence dynamics. Quantum logic operations can be performed on these superfluid polariton qubits with use of control laser pulses. We demonstrate the Hadamard and Pauli operations on a single qubit, the entanglement of two qubits and double-qubit gate operations. The new platform for quantum computing provided by polariton lasers is highly promising due to the remarkable scalability of polariton quantum networks and their potential for room temperature operation.  

Bio:

Alexey Kavokin got his PhD in Physics from the Ioffe institute of Russian Academy of Sciences in 1993. He served as a Professor at the Blaise-Pascal university, Clermont-Ferrand, France, in 1998-2005, Chair of Nanophysics and Photonics at the University of Southampton in UK, 2005-2024, and Chair Professor and Director of the International Center for Polaritonics at the Westlake university, Hangzhou, China, 2018-2024. At present, Kavokin is a Director of the Abrikosov Center for Theoretical Physics at the Moscow Institute of Physics and Technology, Russia.