研究目的
To demonstrate efficient heralding and readout of single collective excitations in warm caesium vapour, achieving a long collective excitation lifetime and verifying non-classical light-matter correlations.
研究成果
The study demonstrates a long single-collective excitations lifetime of 0.27 ± 0.04 ms and a generation efficiency of (63 ± 1)% in a room-temperature atomic vapour system. Non-classical light-matter correlations are verified by observing a violation of the Cauchy-Schwarz inequality. Despite current limitations due to noise, the work shows potential for scalable room-temperature quantum repeaters with further improvements.
研究不足
The utility of the results is limited by excess noise from the leakage of the excitation light, four-wave mixing, and other noise sources. The system does not yet represent a single-photon source due to these noise contributions.
1：Experimental Design and Method Selection:
The experiment uses a vapour cell filled with caesium atoms in a homogeneous magnetic field, aligned within a low finesse asymmetric cell cavity to enhance light-atom interaction. The principle of motional averaging is employed to extend the single-collective excitation lifetime.
2：Sample Selection and Data Sources:
Warm caesium vapour is used as the atomic ensemble. The experiment involves sending weak excitation pulses to create and readout single collective excitations.
3：List of Experimental Equipment and Materials:
A home-built external cavity diode laser at 852 nm, caesium vapour cell with anti-relaxation coating, magnetic shield, optical cavities for spectral filtering, and a single-photon detector.
4：Experimental Procedures and Operational Workflow:
The sequence includes optical pumping for state initialization, write and read excitation pulses with controllable delay, and detection of scattered photons through spectral and polarization filtering stages.
5：Data Analysis Methods:
The temporal shape of detected readout photons is analyzed using a model adapted from previous work, and correlation functions are calculated to verify non-classicality.
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