Limits on the deterministic creation of pure single-photon states using parametric down-conversion

Christ, Andreas; Silberhorn, Christine

doi:10.1103/physreva.85.023829

Cited by 116 publications

(123 citation statements)

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“…Previous theoretical considerations of spatial multiplexing schemes utilising PDC have shown that by multiplexing several non-deterministic sources together, deterministic operation can be approached [86] . Christ and Silberhorn [86] examined the impact of multi-photon emission and multiple spectral modes on the performance of spatially multiplexed systems.…”

Section: Multiplexing: a Route To Deterministic Operationmentioning

confidence: 99%

“…Christ and Silberhorn [86] examined the impact of multi-photon emission and multiple spectral modes on the performance of spatially multiplexed systems.…”

Section: Multiplexing: a Route To Deterministic Operationmentioning

confidence: 99%

“…This undertaking builds on the work of Christ and Silberhorn [86] who considered a set of spatially multiplexed PDC sources. Here we extend the consideration to include the effect that loss in imperfect components has on the probability of delivering a single photon from the scheme.…”

Section: Overviewmentioning

confidence: 99%

“…The fourth and final column, displays the achievable heralding probability for a given fidelity of a heralded state, and allows direct comparison to the work of Christ and Silberhorn [86] . The ideal deterministic source of single photons lies in the top right corner.…”

Section: Effect Of Pnr Detector Efficiencymentioning

confidence: 99%

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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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Section: Multiplexing: a Route To Deterministic Operationmentioning

confidence: 99%

“…Christ and Silberhorn [86] examined the impact of multi-photon emission and multiple spectral modes on the performance of spatially multiplexed systems.…”

Section: Multiplexing: a Route To Deterministic Operationmentioning

confidence: 99%

Section: Overviewmentioning

confidence: 99%

Section: Effect Of Pnr Detector Efficiencymentioning

confidence: 99%

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

Francis-Jones

2017

Springer Theses

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“…An HPS is a photon-pair source in which one photon of each photon-pair is detected at the source to trigger a heralding signal that could be used to herald the presence of the other photon of the same pair [13][14][15][16][17][18][19]. As the detected photon plays a heralding role, it is called the heralding photon.…”

Section: Introductionmentioning

confidence: 99%

Efficient heralding of O-band passively spatial-multiplexed photons for noise-tolerant quantum key distribution

Liu¹,

Lim²

2014

Opt. Express

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When implementing O-band quantum key distribution on optical fiber transmission lines carrying C-band data traffic, noise photons that arise from spontaneous Raman scattering or insufficient filtering of the classical data channels could cause the quantum bit-error rate to exceed the security threshold. In this case, a photon heralding scheme may be used to reject the uncorrelated noise photons in order to restore the quantum bit-error rate to a low level. However, the secure key rate would suffer unless one uses a heralded photon source with sufficiently high heralding rate and heralding efficiency. In this work we demonstrate a heralded photon source that has a heralding efficiency that is as high as 74.5%. One disadvantage of a typical heralded photon source is that the long deadtime of the heralding detector results in a significant drop in the heralding rate. To counter this problem, we propose a passively spatial-multiplexed configuration at the heralding arm. Using two heralding detectors in this configuration, we obtain an increase in the heralding rate by 37% and a corresponding increase in the heralded photon detection rate by 16%. We transmitted the O-band photons over 10 km of noisy optical fiber to observe the relation between quantum bit-error rate and noise-degraded second-order correlation function of the transmitted photons. The effects of afterpulsing when we shorten the deadtime of the heralding detectors are also observed and discussed.

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Lithium Niobate on Insulator: An Emerging Platform for Integrated Quantum Photonics

Saravi

Pertsch

Setzpfandt

2021

Advanced Optical Materials

111

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Limits on the deterministic creation of pure single-photon states using parametric down-conversion

Cited by 116 publications

References 63 publications

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

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

Efficient heralding of O-band passively spatial-multiplexed photons for noise-tolerant quantum key distribution

Lithium Niobate on Insulator: An Emerging Platform for Integrated Quantum Photonics

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