Limits on manipulating conditional photon statistics via interference of weak lasers
- Limits on manipulating conditional photon statistics via interference of weak lasers
- 문성욱; 한상욱; 김용수; 조영욱; 정지성; 홍강희; 오경환; 김윤호
- Photon statistics; Coherent optical effects
- Issue Date
- Optics express
- VOL 25, NO 9-10621
- Photon anti-bunching, measured via the Hanbury-Brown– Twiss experiment, is one of the key signatures of quantum light and is tied to sub-Poissonian photon number statistics. Recently, it has been reported that photon anti-bunching or conditional sub-Poissonian photon number statistics can be obtained via second-order interference of mutually incoherent weak lasers and heralding based on photon counting [Phys. Rev. A 92, 033855 (2015); Opt. Express 24, 19574 (2016); https://arxiv.org/abs/1601.08161]. Here, we report theoretical analysis on the limits of manipulating conditional photon statistics via interference of weak lasers. It is shown that conditional photon number statistics can become super-Poissonian in such a scheme. We, however, demonstrate explicitly that it cannot become sub-Poissonian, i.e., photon anti-bunching cannot be obtained in such a scheme. We point out that incorrect results can be obtained if one does not properly account for seemingly negligible higher-order photon number expansions of the coherent state.
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