Abstract
In this paper, we carry out investigation on the HOM interference between two independent photons by using interference filters with different bandwidth both in theory and experiment. Our experimental results are consistent with the theoretical predictions. From the experimental and theoretical results, we find that interference filters with a narrower bandwidth can help to give a larger coherence length, due to the broadening of photon wave-packet in the spatial domain, resulting in an higher interference visibility. Furthermore, a combination of interference filters with different bandwidths may help to achieve a nice balance between coincidence counting rate and interference visibility. Our present work might provide valuable reference for further implementation of HOM interference in the field of quantum information.
Highlights
Quantum interference plays an important role in quantum information processing, such as quantum cryptography[1], quantum teleportation[2], quantum repeater[3], and linear optical quantum computation[4,5,6]
We firstly introduce the theory of HOM interference, including a basic model of two-photon interference and four-fold HOM interference with two independent spontaneous parametric down conversion (SPDC)
The interference curve presents a longer coherent length for the sets utilizing interference filters with a narrower bandwidth, see the curve marked with 2 & 2 nm. This is due to the broadening of the photon wave-packet in the spatial domain caused by a narrower interference filter
Summary
Quantum interference plays an important role in quantum information processing, such as quantum cryptography[1], quantum teleportation[2], quantum repeater[3], and linear optical quantum computation[4,5,6]. For two-photon cases, HOM interference is a second-order coherent effect in quantum optics that is caused by the combination of the indistinguishability and the probability amplitude that both photons are reflected and transmitted by the beam splitter[17]. Both the visibility and the width of HOM dip depend on the degree of indistinguishability of the two photons for temporal, spatial, or spectral character. We firstly introduce the theory of HOM interference, including a basic model of two-photon interference and four-fold HOM interference with two independent SPDC www.nature.com/scientificreports/. The experimental results are discussed and a conclusion is summarized
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