Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength

Jin, Rui-Bo; Shimizu, Ryosuke; Wakui, Kentaro; Fujiwara, Mikio; Yamashita, Taro; Miki, Shigehito; Terai, Hirotaka; Wang, Zhen; Sasaki, Masahide

doi:10.1364/oe.22.011498

Cited by 78 publications

(76 citation statements)

References 51 publications

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“…When post-selected on its two-photon component, this state gives the desired polarization entangled photon pair [31]. The underlying essence behind the generation of entanglement here is the lack of information as to which of the two pumps resulted in the generation of the downconverted photon pairs.…”

Section: A Polarization Entanglement Based On a Pair Of Spdc Sourcesmentioning

confidence: 99%

Progress towards practical device-independent quantum key distribution with spontaneous parametric down-conversion sources, on-off photodetectors, and entanglement swapping

Seshadreesan¹,

Takeoka²,

Sasaki³

2016

Phys. Rev. A

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Device-independent quantum key distribution (DIQKD) guarantees unconditional security of secret key without making assumptions about the internal workings of the devices used. It does so using the loophole-free violation of a Bell's inequality. The primary challenge in realizing DIQKD in practice is the detection loophole problem that is inherent to photonic tests of Bell's inequalities over lossy channels. We revisit the proposal of Curty and Moroder [Phys. Rev. A 84, 010304(R) (2011)] to use a linear optics-based entanglementswapping relay (ESR) to counter this problem. We consider realistic models for the entanglement sources and photodetectors; more precisely, (a) polarization-entangled states based on pulsed spontaneous parametric downconversion (SPDC) sources with infinitely higher order multi-photon components and multimode spectral structure, and (b) on-off photodetectors with non-unit efficiencies and non-zero dark count probabilities. We show that the ESR-based scheme is robust against the above imperfections and enables positive key rates at distances much larger than what is possible otherwise.

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Section: A Polarization Entanglement Based On a Pair Of Spdc Sourcesmentioning

confidence: 99%

Progress towards practical device-independent quantum key distribution with spontaneous parametric down-conversion sources, on-off photodetectors, and entanglement swapping

Seshadreesan¹,

Takeoka²,

Sasaki³

2016

Phys. Rev. A

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“…Another example is the EPR interference test (also called correlation measurement) for polarization entangled photon pairs. We consider the Sagnac loop entanglement source, which was proposed in [29] and is now widely used for photonic QIP experiments [18,[30][31][32][33]. Here we compare our model with the EPR interference experiment performed by a Sagnac loop entanglement source in [18].…”

Section: Epr Interference Of a Sagnac Loop Entanglement Sourcementioning

confidence: 99%

Full analysis of multi-photon pair effects in spontaneous parametric down conversion based photonic quantum information processing

2015

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In spontaneous parametric down conversion (SPDC) based quantum information processing (QIP) experiments, there is a tradeoff between the coincide count rates (i.e. the pumping power of the SPDC), which limits the rate of the protocol, and the visibility of the quantum interference, which limits the quality of the protocol. This tradeoff is mainly caused by the multi-photon pair emissions from the SPDCs. In theory, the problem is how to model the experiments without truncating these multi-photon emissions while including practical imperfections.In this paper, we establish a method to theoretically simulate SPDC based QIPs which fully incorporates the effect of multi-photon emissions and various practical imperfections. The key ingredient in our method is the application of the characteristic function formalism which has been used in continuous variable QIPs. We apply our method to three examples, the Hong-Ou-Mandel interference and the Einstein-Podolsky-Rosen interference experiments, and the concatenated entanglement swapping protocol. For the first two examples, we show that our theoretical results quantitatively agree with the recent experimental results. Also we provide the closed expressions for these the interference visibilities with the full multi-photon components and various imperfections. For the last example, we provide the general theoretical form of the concatenated entanglement swapping protocol in our method and show the numerical results up to 5 concatenations. Our method requires only a small computation resource (few minutes by a commercially available computer) which was not possible by the previous theoretical approach. Our method will have applications in a wide range of SPDC based QIP protocols with high accuracy and a reasonable computation resource.

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“…Thanks to the GVM condition, the spectral purity is much higher at telecom wavelength than that at visible wavelengths39. The multi-pair components in our PPKTP source as a function of pump power were investigated in our previous work31.…”

Section: Methodsmentioning

confidence: 99%

Detection-dependent six-photon Holland-Burnett state interference

Jin

Fujiwara

Shimizu

et al. 2016

Sci Rep

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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.

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Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength

Cited by 78 publications

References 51 publications

Progress towards practical device-independent quantum key distribution with spontaneous parametric down-conversion sources, on-off photodetectors, and entanglement swapping

Progress towards practical device-independent quantum key distribution with spontaneous parametric down-conversion sources, on-off photodetectors, and entanglement swapping

Full analysis of multi-photon pair effects in spontaneous parametric down conversion based photonic quantum information processing

Detection-dependent six-photon Holland-Burnett state interference

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