Coherence time limit of the biphotons generated in a dense cold atom cloud.
Coherence time limit of the biphotons generated in a dense cold atom cloud.
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致密冷原子云中产生的双光子的相干时间极限
DOI:
10.1038/srep09126
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发表时间:
2015-03-17
影响因子:
4.6
通讯作者:
Zhang W
中科院分区:
文献类型:
--
作者:
Han Z;Qian P;Zhou L;Chen JF;Zhang W
Biphotons with narrow bandwidth and long coherence time can enhance light-atominteraction, which leads to strong coupling between photonic and atomic qubits.Such strong coupling is desirable in quantum information processing, quantumstorage and communication. In particular, paired photons with a long coherencetime over submicroseconds facilitate the direct manipulation of biphoton wavefunction.In this paper, we report the narrow-band biphotons with a coherence time of2.34 μs generated from spontaneous four-wave mixing (SFWM)in a dense cold atom cloud, in which the anti-Stokes photons go through anarrow electromagnetically-induced transparency (EIT) window. In our knowledge,this is the best record of coherence time for paired photons achieved so far.A number of factors limiting the coherence time are analyzed in detail. Wefind the EIT coherence plays an essential role in determining the coherencetime for paired photons. The EIT dephasing rate is the ultimate limit to thecoherence time and an ultra-long coherence time above ten microseconds ispossible by further improvement of the dephasing rate below 100 kHz.
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