Single telecom photon heralding by wavelength multiplexing in an optical fiber

Lenhard, Andreas; Brito, José; Kucera, Stephan; Bock, Matthias; Eschner, J.; Becher, Christoph

doi:10.1007/s00340-015-6284-9

Cited by 8 publications

(7 citation statements)

References 19 publications

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“…Although the telecom C-band corresponds to the region of maximal transmission into a glass fiber, the spectral dispersion acquired during propagation of the single photons [34] could still affect the TPI visibility over long distances. To further investigate the effect of photon wave packet distortion in a realistic building-to-building fiber-network scenario, remote TPI with additional fiber path length of up to 2 km was carried out.…”

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confidence: 99%

Two-photon interference in the telecom C-band after frequency conversion of photons from remote quantum emitters

et al. 2018

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Efficient fiber-based long-distance quantum communication via quantum repeaters relies on deterministic single-photon sources at telecom wavelengths, with the potential to exploit the existing world-wide infrastructures. For upscaling the experimental complexity in quantum networking, two-photon interference (TPI) of remote non-classical emitters in the low-loss telecom bands is of utmost importance. With respect to TPI of distinct emitters, several experiments have been conducted, e.g., using trapped atoms [1], ions [2], NV-centers [3, 4], SiV-centers [5], organic molecules[6] and semiconductor quantum dots (QDs) [7][8][9][10][11][12][13][14]; however, the spectral range was far from the highly desirable telecom C-band. Here, we report on TPI at 1550 nm between down-converted single photons from remote QDs [15], demonstrating quantum frequency conversion [16][17][18] as precise and stable mechanism to erase the frequency difference between independent emitters. On resonance, a TPI-visibility of (29 ± 3) % has been observed, being only limited by spectral diffusion processes of the individual QDs [19,20]. Up to 2-km of additional fiber channel has been introduced in both or individual signal paths with no influence on TPI-visibility, proving negligible photon wave-packet distortion. The present experiment is conducted within a local fiber network covering several rooms between two floors of the building. Our studies pave the way to establish long-distance entanglement distribution between remote solid-state emitters including interfaces with various quantum hybrid systems [21][22][23][24].

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confidence: 99%

Two-photon interference in the telecom C-band after frequency conversion of photons from remote quantum emitters

et al. 2018

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“…55 An additional effect besides PMD in the context of a fiber-based network is chromatic dispersion, which leads to a temporal broadening of the wavefunctions. 35,56 This lowers the success probability of two-photon interference, but can be countered by the design of the optical setup, as we will discuss in Sec. III.…”

Section: Polarization Entangled Photon Pairs From Quantum Dotsmentioning

confidence: 99%

Quantum dots as potential sources of strongly entangled photons: Perspectives and challenges for applications in quantum networks

Schimpf

Reindl

Basset

et al. 2021

Applied Physics Letters

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“…An additional effect to consider in the context of a fiberbased network is chromatic dispersion, which leads to a temporal broadening of the wavefunctions 50,51 . This lowers the success probability of two-photon interference, which we will discuss in the next section.…”

Section: (A) Recently Circular Bragg Resonators Have Demonstrated Val...mentioning

confidence: 99%

“…The teleportation of the entanglement is enabled by two-photon interference to perform a so-called Bell state measurement (BSM). The success of a BSM strongly depends on the photon indistinguishability, which, in turn, depends on the photon sources and can be experimentally accessed by probing the interference visibility in a Hong-Ou-Mandel (HOM) experiment 50 . For maximum visibility the spatio-temporal wave packets of the two photons involved in the BSM have to be identical and pure, i.e.…”

Section: Quantum Dots In a Quantum Repeater Based Networkmentioning

confidence: 99%

Quantum dots as potential sources of strongly entangled photons for quantum networks

Schimpf,

Reindl,

Basset

et al. 2020

Preprint

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The generation and long-haul transmission of highly entangled photon pairs is a cornerstone of emerging photonic quantum technologies, with key applications such as quantum key distribution and distributed quantum computing. However, a natural limit for the maximum transmission distance is inevitably set by attenuation in the medium. A network of quantum repeaters containing multiple sources of entangled photons would allow to overcome this limit. For this purpose, the requirements on the source's brightness and the photon pairs' degree of entanglement and indistinguishability are stringent. Despite the impressive progress made so far, a definitive scalable photon source fulfilling such requirements is still being sought for. Semiconductor quantum dots excel in this context as sub-poissonian sources of polarization entangled photon pairs. In this work we present the state-of-the-art set by GaAs based quantum dots and use them as a benchmark to discuss the challenges to overcome towards the realization of practical quantum networks.

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Single telecom photon heralding by wavelength multiplexing in an optical fiber

Cited by 8 publications

References 19 publications

Two-photon interference in the telecom C-band after frequency conversion of photons from remote quantum emitters

Two-photon interference in the telecom C-band after frequency conversion of photons from remote quantum emitters

Quantum dots as potential sources of strongly entangled photons: Perspectives and challenges for applications in quantum networks

Quantum dots as potential sources of strongly entangled photons for quantum networks

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