Abstract
Exciton-polariton condensates have attractive features for quantum computation, e.g., room temperature operation, high dynamical speed, ease of probe, and existing fabrication techniques. Here, we present a complete theoretical scheme of quantum computing with exciton-polariton condensates formed in semiconductor micropillars. Quantum fluctuations on top of the condensates are shown to realize qubits, which are externally controllable by applied laser pulses. Quantum tunneling and nonlinear interactions between the condensates allow SWAP, square-root-SWAP and controlled-NOT gate operations between the qubits.
Highlights
Exciton-polaritons are hybrid light-matter particles, where the small dephasing of a photonic system is blended with the particle–particle interactions from a condensed matter system
The overwhelming majority of research into exciton-polaritons has been focused on semi-classical physics, that is, physics where the quantization of the particle number according to quantum theory is not itself apparent: Bose-Einstein condensation and polariton lasing;[1] quantum fluids and solitons;[2] and topological polaritons[3] are all well-described within semi-classical theory
It has always been expected that exciton-polaritons are quantum particles,[4] theoretically capable of entanglement,[5,6] and it has been speculated that polaritons could perform as quantum computers[7,8] or quantum simulators.[9,10]
Summary
Exciton-polaritons are hybrid light-matter particles, where the small dephasing of a photonic system is blended with the particle–particle interactions from a condensed matter system. A A polariton condensate confined in a semiconductor micropillar and excited with a coherent laser supports a qubit suitable for quantum computing.
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