Abstract
The NOON state, and its experimental approximation the Holland-Burnett state, have important applications in phase sensing measurement with enhanced sensitivity. However, most of the previous Holland-Burnett state interference (HBSI) experiments only investigated the area of the interference pattern in the region immediately around zero optical path length difference, while the full HBSI pattern over a wide range of optical path length differences has not yet been well explored. In this work, we experimentally and theoretically demonstrate up to six-photon HBSI and study the properties of the interference patterns over a wide range of optical path length differences. It was found that the shape, the coherence time and the visibility of the interference patterns were strongly dependent on the detection schemes. This work paves the way for applications which are based on the envelope of the HBSI pattern, such as quantum spectroscopy and quantum metrology.
Highlights
Multi-photon entanglement and multi-photon interference are useful nonclassical phenomena in quantum information applications[1,2]
It was found that the shape, the coherence time and the visibility of the interference patterns were strongly dependent on the detection schemes
A summary of the experiment will be presented here while a more detailed description of the components will be presented in the Methods. 792 nm wavelength laser pulses of temporal duration 2 ps emitted from a mode-locked Titanium sapphire laser (Mira[900], Coherent Co.) at a pulse repetition frequency of 76 MHz pumped a 30-mm-long, 46.1 μm poling period potassium titanyl phosphate (KTP) crystal for type-II group-velocity-matched SPDC26,27
Summary
Multi-photon entanglement and multi-photon interference are useful nonclassical phenomena in quantum information applications[1,2]. Many HB state interference (HBSI) experiments have been carried out with photon numbers (values of N) from two[12] to four[13,14], and six[5] both at visible and optical fiber telecommunications wavelengths[15,16]. All these previous HBSI schemes mainly considered the period-based applications and only measured the single-mode interference pattern, which comprises solely of the portion of the interference patterns around zero optical path length difference. It was found that the shape, the coherence time and the visibility of the interference patterns were strongly dependent on the detection schemes
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