Quantum optics of spin waves through ac Stark modulation

Abstract

We bring the set of linear quantum operations, important for many fundamental studies in photonic systems, to the material domain of collective excitations known as spin waves. Using the ac Stark effect we realize quantum operations on single excitations and demonstrate a spin-wave analogue of Hong-Ou-Mandel effect, realized via a beamsplitter implemented in the spin wave domain. Our scheme equips atomic-ensemble-based quantum repeaters with quantum information processing capability and can be readily brought to other physical systems, such as doped crystals or room-temperature atomic ensembles.

arXiv comment6 pages + 12 pages supplemental, 5 figures + 13 supplementary figures

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• Coherent spin-wave processor of stored optical pulses
• Temporal imaging for ultra-narrowband few-photon states of light
• Continuous protection of a collective state from inhomogeneous dephasing
• Single-photon hologram of a zero-area pulse
• Massively-multiplexed generation of Bell-type entanglement using a quantum memory
• Spatial spin-wave modulator for quantum memory assisted adaptive measurements
• Entanglement distribution with wavevector-multiplexed quantum memory
• Real-time ghost imaging of Bell-nonlocal entanglement between a photon and a quantum memory
• Light-induced fictitious magnetic fields for quantum storage in cold atomic ensembles
• Quantum-router: Storing and redirecting light at the photon level
• Long-lived collective Rydberg excitations in atomic gas achieved via ac-Stark lattice modulation
• Coherent optical two-photon resonance tomographic imaging in three dimensions
• Spectrum-to-position mapping via programmable spatial dispersion implemented in an optical quantum memory
• Superradiant parametric conversion of spin waves
• Experimental interference of uncorrelated photons