Efficient quantum memory for heralded single photons generated by
cavity-enhanced spontaneous parametric downconversion
- URL: http://arxiv.org/abs/2011.14948v1
- Date: Mon, 30 Nov 2020 16:19:39 GMT
- Title: Efficient quantum memory for heralded single photons generated by
cavity-enhanced spontaneous parametric downconversion
- Authors: Yu-Chih Tseng, Yan-Cheng Wei, Ying-Cheng Chen
- Abstract summary: We interface a spontaneous parametric down conversion (SPDC) crystal and a cold atomic ensemble.
We demonstrate a highly efficient quantum memory through polarization-encoded single-photon qubits.
The results pave the way toward large-scale quantum network.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We interface a spontaneous parametric down conversion (SPDC) crystal and a
cold atomic ensemble and demonstrate a highly efficient quantum memory through
polarization-encoded single-photon qubits. Specifically, narrowband heralded
single photons from a cavity-enhanced SPDC source is stored using cold atomic
ensemble, with ~70% storage-and-retrieval efficiency and ~10$\mu$s storage time
at 50% efficiency. To prevent the degradation after storage, we also manipulate
the single-photon wave profile so that the retrieved non-classical nature of
single photon is preserved. On the other hand, the dual-rail storage is used
for storing polarization-encoded qubits, and the corrected fidelity of flying
qubits after storage reaches ~97%. The results pave the way toward large-scale
quantum network.
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