Abstract
In this Letter, we propose a hybrid scheme to implement a photonic controlled-z (CZ) gate using photon storage in highly excited Rydberg states, which controls the effective photon-photon interaction using resonant microwave fields. Our scheme decouples the light propagation from the interaction and exploits the spatial properties of the dipole blockade phenomenon to realize a CZ gate with minimal loss and mode distortion. By excluding the coupling efficiency, fidelities exceeding 95% are achievable and are found to be mainly limited by motional dephasing and the finite lifetime of the Rydberg levels.
Highlights
In this Letter, we propose a hybrid scheme to implement a photonic controlled-z (CZ) gate using photon storage in highly excited Rydberg states, which controls the effective photon-photon interaction using resonant microwave fields
Optical photons are ideal for quantum communication, their utility for computation is limited by the lack of strong photon-photon interactions [1,2]
Quantum gate protocols based on Rydberg atoms have been proposed [12] and realized [13,14] where the information was encoded in the ground state of the atoms instead of photons
Summary
In this Letter, we propose a hybrid scheme to implement a photonic controlled-z (CZ) gate using photon storage in highly excited Rydberg states, which controls the effective photon-photon interaction using resonant microwave fields. We use the dark-state polariton protocol [23,24] to convert two photonic qubits (control and target) in the dual rail encoding into collective excitations with Rydberg character in different positions or sites in an ensemble of cold atoms.
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