Entanglement between a photonic time-bin qubit and a collective atomic spin excitation

Abstract

Entanglement between light and matter combines the advantage of long distance transmission of photonic qubits with the storage and processing capabilities of atomic qubits. To distribute photonic states efficiently over long distances several schemes to encode qubits have been investigated -- time-bin encoding being particularly promising due to its robustness against decoherence in optical fibers. Here, we demonstrate the generation of entanglement between a photonic time-bin qubit and a single collective atomic spin excitation (spin-wave) in a cold atomic ensemble, followed by the mapping of the atomic qubit onto another photonic qubit. A magnetic field that induces a periodic dephasing and rephasing of the atomic excitation ensures the temporal distinguishability of the two time-bins and plays a central role in the entanglement generation. To analyse the generated quantum state, we use largely imbalanced Mach-Zehnder interferometers to perform projective measurements in different qubit bases and verify the entanglement by violating a CHSH Bell inequality.

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• Challenging local realism with human choices
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• Entanglement between a telecom photon and an on-demand multimode solid-state quantum memory
• A cold atom temporally multiplexed quantum memory with cavity-enhanced noise suppression
• Time Entanglement between a Photon and a Spin Wave in a Multimode Solid-state Quantum Memory
• Non-classical mechanical states guided in a phononic waveguide
• Storing short single-photon-level optical pulses in Bose-Einstein condensates for high-performance quantum memory
• Multiplexed spin-wave-photon entanglement source using temporal-multimode memories and feedforward-controlled readout
• Realization of a programmable multi-purpose photonic quantum memory with over-thousand qubit manipulations
• Strong enhancement of heavy-hole Landé factor $q$ in InGaAs symmetric quantum dots revealed by coherent optical spectroscopy
• High dimensional entanglement between a photon and a multiplexed atomic quantum memory
• Noise suppression in a temporal-multimode quantum memory entangled with a photon via asymmetrical photon-collection channel
• Arbitrary-phase locking of fiber Mach-Zehnder interferometers
• Suppression of dark-state polariton collapses in cold-atom quantum memory
• Analysis of assumptions in BIG Bell Test experiments