Efficient generation of twin photons at telecom wavelengths with 2.5 GHz repetition-rate-tunable comb laser

Jin, Rui-Bo; Shimizu, Ryosuke; Morohashi, Isao; Wakui, Kentaro; Takeoka, Masahiro; Izumi, Shuro; Sakamoto, Takahide; Fujiwara, Mikio; Yamashita, Taro; Miki, Shigehito; Terai, Hirotaka; Wang, Zhen; Sasaki, Masahide

doi:10.1038/srep07468

Cited by 35 publications

(32 citation statements)

References 34 publications

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“…The measured heralding efficiency is P 1 ≈ 42%. As discussed in [166], the high repetition rate of the laser allows producing photon pairs at a high rate while, per each pump pulse, n is maintained as low as required for negligible two-photon events. Thanks to this strategy, single photons can be heralded at rates reaching values as high as 2.1 MHz, with a constant g (2) (0) as low as 0.023.…”

Section: Heralded Single Photon Sourcesmentioning

confidence: 99%

Quantum photonics at telecom wavelengths based on lithium niobate waveguides

Alibart¹,

D’Auria²,

Micheli³

et al. 2016

J. Opt.

162

116

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Integrated optical components on lithium niobate play a major role in standard high-speed communication systems. Over the last two decades, after the birth and positioning of quantum information science, lithium niobate waveguide architectures have emerged as one of the key platforms for enabling photonics quantum technologies. Due to mature technological processes for waveguide structure integration, as well as inherent and efficient properties for nonlinear optical effects, lithium niobate devices are nowadays at the heart of many photon-pair or triplet sources, single-photon detectors, coherent wavelength-conversion interfaces, and quantum memories. Consequently, they find applications in advanced and complex quantum communication systems, where compactness, stability, efficiency, and interconnectability with other guided-wave technologies are required. In this review paper, we first introduce the material aspects of lithium niobate, and subsequently discuss all of the above mentioned quantum components, ranging from standard photon-pair sources to more complex and advanced circuits.

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Section: Heralded Single Photon Sourcesmentioning

confidence: 99%

Quantum photonics at telecom wavelengths based on lithium niobate waveguides

Alibart¹,

D’Auria²,

Micheli³

et al. 2016

J. Opt.

162

116

View full text Add to dashboard Cite

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“…This allows the signal-to-noise of heralded single photons to be increased without affecting the brightness of the source. A number of groups have recently demonstrated high repetition rate photon pair sources [83][84][85] where this effect has been successfully measured through the degree of second order coherence [85] .…”

Section: Multiplexing: a Route To Deterministic Operationmentioning

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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“…The QDs grown on the (311)B crystal surface keep a circular shape, but the QD density is high, typically 9×10 10 cm −2 , at 470°C. It is reduced to the density of 3.4×10 10 cm −2 at 530°C [33]. The average QD lateral size and height are 57 and 5.6 nm, respectively.…”

Section: Sample Preparation and Measurement Setupmentioning

confidence: 99%

“…The quantum entanglement plays an essential role in quantum information processing tasks, such as quantum teleportation [3][4][5] and entanglement swapping [6][7][8]. Parametric down conversion (PDC) has been widely used for quantum entangled photon pairs (QEPPs) sources [9], and the QEPP generation rate has recently been dramatically improved [10]. The intrinsic drawbacks of PDC are the nonzero probability of multiple photon emission at a time and nondeterministic nature of generation processes.…”

Section: Introductionmentioning

confidence: 99%

Optical observation of superconducting density of states in luminescence spectra of InAs quantum dots

et al. 2015

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We study luminescence spectra observed from InAs quantum dots (QDs) embedded in an n-type InGaAs-based heterostructure, where electron Cooper pairs penetrate from an adjacent niobium (Nb) superconductor with the proximity effect. Below the superconducting (SC) critical temperature of Nb, we observe substantial luminescence intensity enhancement and a sharp edge in luminescence spectra of InAs QDs. We explain the observed sharp edge in the luminescence spectra with the proximity effect, that is, with the consideration of opening of SC gap and modification of density of states (DOS) near the electron Fermi level in the n-type semiconductor heterostructure. We demonstrate that the sharp edge luminescence spectra are well reproduced by the SC DOS, with quasiparticle lifetime broadening and a Gaussian distribution of lowest QD state emission lines. We discuss the reason why it has been difficult to observe the sharp edge luminescence spectra in the previous quantum well-based SC light emitting diodes.

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Efficient generation of twin photons at telecom wavelengths with 2.5 GHz repetition-rate-tunable comb laser

Cited by 35 publications

References 34 publications

Quantum photonics at telecom wavelengths based on lithium niobate waveguides

Quantum photonics at telecom wavelengths based on lithium niobate waveguides

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

Optical observation of superconducting density of states in luminescence spectra of InAs quantum dots

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