High brightness single mode source of correlated photon pairs using a photonic crystal fiber

Fulconis, J; Alibart, Olivier; Wadsworth, W.J.; Russell, P. St. J.; Rarity, John

doi:10.1364/opex.13.007572

Cited by 151 publications

(125 citation statements)

References 25 publications

(27 reference statements)

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“…The later experiments follow earlier work in which χ 3 non linearity was used to generate photon pairs in conventional optical fibers [12,13,14] and photonic crystal fibers [15,16]. In fiber experiments Raman scattering is often an important source of noise [13] whereas it should be negligible in SOI waveguides (see however below) as Raman gain is restricted to a narrow bandwidth far detuned (15.6 THz.)…”

Section: Introductionmentioning

confidence: 82%

Self-pulsing and chaos in short chains of coupled nonlinear microcavities

2009

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Silicon waveguides are promising χ 3 -based photon pair sources. Demonstrations so far have been based on picosecond pulsed lasers. Here, we present the first investigation of photon pair generation in silicon waveguides in a continuous regime. The source is characterized by coincidence measurements. We uncover the presence of unexpected noise which had not been noticed in earlier experiments. Subsequently, we present advances towards integration of the photon pair source with other components on the chip. This is demonstrated by photon pair generation in a Sagnac loop interferometer and inside a micro-ring cavity. Comparison with the straight waveguide shows that these are promising avenues for improving the source. In particular photon pair generation in the micro-ring cavity yields a source with a spectral width of approximately 150 pm resulting in a spectral brightness increased by more than 2 orders of magnitude.

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Section: Introductionmentioning

confidence: 82%

Self-pulsing and chaos in short chains of coupled nonlinear microcavities

2009

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“…The second is based on "heralding," in which one photon (the "signal") is detected and used as a trigger to herald the presence of a paired photon (the "idler"). Sources of this type have been demonstrated mainly in guided nonlinear media, such as χ (2) waveguides [8][9][10][11][12][13] and χ (3) fibers [14][15][16][17]. Heralded sources using guided media have one key advantage that the photons are generated in a single welldefined spatial mode, as opposed to a mixture of modes in the case of single-emitter sources.…”

Section: Introductionmentioning

confidence: 99%

Optimized heralding schemes for single photons

2011

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A major obstacle to a practical, heralded source of single photons is the fundamental trade-off between high heralding efficiency and high production rate. To overcome this difficulty, we propose applying sequential spectral and temporal filtering on the signal photons before they are detected for heralding. Based on a multimode theory that takes into account the effect of simultaneous multiple photon-pair emission, we find that these filters can be optimized to yield both a high heralding efficiency and a high production rate. While the optimization conditions vary depending on the underlying photon-pair spectral correlations, all correlation profiles can lead to similarly high performance levels when optimized filters are employed. This suggests that a better strategy for improving the performance of heralded single-photon sources is to adopt an appropriate measurement scheme for the signal photons, rather than tailoring the properties of the photon-pair generation medium.

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“…Recently pumping slightly blue shifted into the normal dispersion region has been shown to generate widely separated, phase matched, parametric amplification peaks [23]. It is this discovery that has stimulated our recent exploration of PCF optical nonlinearities at the single photon level [21,24,25,26].Spontaneous parametric downconversion occurs when a pump photon spontaneously splits into two daughter photons via a three-wave mixing process in a χ (2) nonlinear crystal. By carefully designing the collection scheme and pumping strategy various sources of heralded single photons and entangled photon pairs in the cw and pulsed regimes have been realised [27,28].…”

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confidence: 99%

Nonclassical Interference and Entanglement Generation Using a Photonic Crystal Fiber Pair Photon Source

et al. 2007

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We demonstrate two key components for optical quantum information processing: a bright source of heralded single photons; and a bright source of entangled photon pairs. A pair of pump photons produces a correlated pair of photons at widely spaced wavelengths (583 nm and 900 nm), via a χ (3) four-wave mixing process. We demonstrate a non-classical interference between heralded photons from independent sources with a visibility of 95%, and an entangled photon pair source, with a fidelity of 89% with a Bell state.Single photons are ideal for quantum technologies, including quantum communication [1] and quantum metrology [2], due to intrinsically low decoherence and easy one-qubit rotations. However, realising two-qubit logic gates for quantum computation requires a massive optical nonlinearity. Measurement-induced nonlinearies can be realised using only single photon sources and detectors, and linear optical networks [3]. Much progress has been made on each of these components, however, progress on linear optical networks is currently limited by the lack of bright single and pair photon sources. Here we describe a solution based on photonic crystal fibres: four wave mixing produces a correlated pair of photons at widely spaced wavelengths (583nm and 900nm). We demonstrate a bright source of heralded single photons, exhibiting a non-classical interference visibility of 95% for independent sources; and a bright entangled pair source, with 89% fidelity with a maximally entangled state. These sources provide an essential toolkit for photonic quantum information processing.Since the original proposal [3] there have been a number of important theoretical improvements [4,5,6] and experimental proof-of-principal demonstrations [7,8,9,10,11,12], which combined make optical quantum computing promising. Experiments have typically relied on producing photons via spontaneous parametric downconversion, and detecting them with silicon avalanche photodetectors (Si APDs) with intrinsic quantum efficiencies of ∼ 70% and no number resolution. However, the practical limit of standard downconversion is five [11,13] or six [14] photons. Tremendous progress has been made in the development of triggered, high efficiency single photon sources [15,16,17,18] (SPSs) and high efficiency, number resolving single photon detectors [19,20], however, these technolgies will not be commonplace in single photon quantum optics labs for some time. Therefore, in order to make further progress in testing single photon optical circuits for generation of large entangled cluster states, error correcting protocols, and measurement of fault tolerant thresholds, there is an urgent practical need for a bright SPS at the visible wavelengths where Si APDs are efficient.The development of microstructured and photonic crystal fibres [22] (PCFs) enables the engineering of profoundly different optical properties to conventional optical fibres, opening the way for a range of new technologies. PCFs with very small solid cores ( Fig. 1(a)) can have zero dispersion wavele...

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High brightness single mode source of correlated photon pairs using a photonic crystal fiber

Cited by 151 publications

References 25 publications

Self-pulsing and chaos in short chains of coupled nonlinear microcavities

Self-pulsing and chaos in short chains of coupled nonlinear microcavities

Optimized heralding schemes for single photons

Nonclassical Interference and Entanglement Generation Using a Photonic Crystal Fiber Pair Photon Source

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