Narrowband high-fidelity all-fibre source of heralded single photons at 1570 nm

McMillan, Alex; Fulconis, J; Halder, M.; Xiong, Chunle; Rarity, John; Wadsworth, William J.

doi:10.1364/oe.17.006156

Cited by 67 publications

(73 citation statements)

References 28 publications

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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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Section: Introductionmentioning

confidence: 99%

Optimized heralding schemes for single photons

2011

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“…The generation, collection, delivery and detection (fibre coupled detectors) can all be achieved in optical fibre, allowing for a truly integrated device in which the photons are emitted into a well-defined spatial mode and which is significantly easier to maintain for the end user [33,57] . A number of similar approaches have been made using waveguide sources, for both PDC [58,59] and FWM in optical fibres [52,[60][61][62] , and in recent years FWM in chip-based waveguides such as silicon photonic crystal waveguides [63,64] , chalcogenide waveguide [65] , and UV-written fused silica waveguides [66] .…”

Section: Heralded Single Photon Sourcesmentioning

confidence: 99%

“…Although only the fibre-based source of McMillan et. al [57] could be described as a true integrated device.…”

Section: Heralded Single Photon Sourcesmentioning

confidence: 99%

Active Multiplexing of Spectrally Engineered Heralded Single Photons in an Integrated Fibre Architecture

Francis-Jones

2017

Springer Theses

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In recent years, there has been rapid development in processing of quantum information using quantum states of light. The focus is now turning towards developing real-world implementations of technologies such as all-optical quantum computing and cryptography. The ability to consistently create and control the required single photon states of light is crucial for successful operation. Therefore, high performance single photon sources are very much in demand.The most common approach of generating the required nonclassical states of light is through spontaneous photon pair generation in a nonlinear medium. One photon in the pair is detected to "herald" the presence of the remaining single photon. For many applications the photons are required to be in pure indistinguishable states. However, photon pairs generated in this manner typically suffer from spectral correlations, which can lead to the production of mixed, distinguishable states. Additionally, these sources are probabilistic in nature, which fundamentally limits the number of photons that can be delivered simultaneously by independent sources and hence the scalability of these future technologies.One route to deterministic operation is by actively multiplexing several independent sources together to increase the probability of delivering a single photon from the system. This thesis presents the development and analysis of a multiplexing scheme of heralded single photons in high-purity indistinguishable states within an integrated optical fibre system. The spectral correlations present between the two photons in the pair were minimised by spectrally engineering each photonic crystal fibre source. A novel, in-fibre, broadband filtering scheme was implemented using photonic bandgap fibres. In total, two sources were multiplexed using a fast optical switch, yielding an 86% increase in the heralded count rate from the system. AcknowledgementsI would first like to express my gratitude to my supervisor Dr. Peter Mosley, for giving me the opportunity to work with him on an exciting and interesting project, and for first introducing me to the world of quantum optics in the final year of my undergraduate degree. Without his support and guidance over the last three years, this thesis and the work that it contains would not have been possible. It has been a tremendously enjoyable learning experience (for both of us I hope!), and I think I can safely say that I now know more about FPGAs than I ever thought or hoped I would! I am incredibly grateful for the opportunity, and eagerly look forward to continue working with you on the upcoming NQIT project.Secondly, I would like to thank all of the staff and students, past and present, of the Centre for Photonics and Photonic Materials for providing an enjoyable, interesting and supportive learning environment. I would particularly like to thank James, for casting his eye over my fibre designs, passing down his fabrication knowledge, and teaching me the dark art of the dispersion rig! I would also especially like to ...

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“…A promising way to prepare single photons is by nonlinear optical processes that generate photon pairs such as spontaneous parametric downconversion [8][9][10] or spontaneous four-wave mixing (SFWM) in, e.g., dispersion-shifted fibers [11], photonic crystal fibers [12][13][14], or silicon waveguides [15,16]. Even though such nonlinear pair-production processes are inherently probabilistic, this can in many cases be compensated for by heralding [17,18], whereby detection of one photon in the pair implies the existence of the other. If reliable photon production is required, near-deterministic behavior can in principle be achieved by multiplexing of such heralded probabilistic sources [19][20][21], Spontaneous-four-wave-mixing processes possess a large number of tunable parameters, allowing great flexibility in the choice of single-photon wavelengths as well as the temporal and spectral properties of generated photon pairs [22].…”

Section: Introductionmentioning

confidence: 99%

Effects of noninstantaneous nonlinear processes on photon-pair generation by spontaneous four-wave mixing

2017

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We present a general model, based on a Hamiltonian approach, for the joint quantum state of photon pairs generated through pulsed spontaneous four-wave mixing, including nonlinear phase modulation and a finite material response time. For the case of a silica fiber, it is found that the pair-production rate depends weakly on the waveguide temperature, due to higher-order Raman scattering events, and more strongly on pump-pair frequency detuning. From the analytical model, a numerical scheme is derived, based on the well-known split-step method. This scheme allows computation of joint states where nontrivial effects are included, such as groupvelocity dispersion and Raman scattering. In this work, the numerical model is used to study the impact of the noninstantaneous response on the prefiltering purity of heralded single photons. We find that for pump pulses shorter than 1 ps, a significant detuning-dependent change in quantum-mechanical purity may be observed in silica. This shows that Raman scattering not only introduces noise, but can also drastically change the spectral correlations in photon pairs when pumped with short pulses.

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Narrowband high-fidelity all-fibre source of heralded single photons at 1570 nm

Cited by 67 publications

References 28 publications

Optimized heralding schemes for single photons

Optimized heralding schemes for single photons

Active Multiplexing of Spectrally Engineered Heralded Single Photons in an Integrated Fibre Architecture

Effects of noninstantaneous nonlinear processes on photon-pair generation by spontaneous four-wave mixing

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