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Caspar P, Verbanis E, Oudot E, Maring N, Samara F, Caloz M, Perrenoud M, Sekatski P, Martin A, Sangouard N, Zbinden H, Thew RT. Heralded Distribution of Single-Photon Path Entanglement. Phys Rev Lett 2020; 125:110506. [PMID: 32975988 DOI: 10.1103/physrevlett.125.110506] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 07/30/2020] [Indexed: 06/11/2023]
Abstract
We report the experimental realization of heralded distribution of single-photon path entanglement at telecommunication wavelengths in a repeater-like architecture. The entanglement is established upon detection of a single photon, originating from one of two spontaneous parametric down-conversion photon pair sources, after erasing the photon's which-path information. In order to certify the entanglement, we use an entanglement witness which does not rely on postselection. We herald entanglement between two locations, separated by a total distance of 2 km of optical fiber, at a rate of 1.6 kHz. This work paves the way towards high-rate and practical quantum repeater architectures.
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Affiliation(s)
- P Caspar
- Department of Applied Physics, University of Geneva, CH-1211 Genève, Switzerland
| | - E Verbanis
- Department of Applied Physics, University of Geneva, CH-1211 Genève, Switzerland
| | - E Oudot
- Department of Applied Physics, University of Geneva, CH-1211 Genève, Switzerland
- Quantum Optics Theory Group, University of Basel, CH-4056 Basel, Switzerland
| | - N Maring
- Department of Applied Physics, University of Geneva, CH-1211 Genève, Switzerland
| | - F Samara
- Department of Applied Physics, University of Geneva, CH-1211 Genève, Switzerland
| | - M Caloz
- Department of Applied Physics, University of Geneva, CH-1211 Genève, Switzerland
| | - M Perrenoud
- Department of Applied Physics, University of Geneva, CH-1211 Genève, Switzerland
| | - P Sekatski
- Quantum Optics Theory Group, University of Basel, CH-4056 Basel, Switzerland
| | - A Martin
- Department of Applied Physics, University of Geneva, CH-1211 Genève, Switzerland
| | - N Sangouard
- Quantum Optics Theory Group, University of Basel, CH-4056 Basel, Switzerland
- Institut de physique théorique, Université Paris Saclay, CEA, CNRS, F-91191 Gif-sur-Yvette, France
| | - H Zbinden
- Department of Applied Physics, University of Geneva, CH-1211 Genève, Switzerland
| | - R T Thew
- Department of Applied Physics, University of Geneva, CH-1211 Genève, Switzerland
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Tsujimoto Y, Sugiura Y, Tanaka M, Ikuta R, Miki S, Yamashita T, Terai H, Fujiwara M, Yamamoto T, Koashi M, Sasaki M, Imoto N. High visibility Hong-Ou-Mandel interference via a time-resolved coincidence measurement. Opt Express 2017; 25:12069-12080. [PMID: 28786565 DOI: 10.1364/oe.25.012069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 05/09/2017] [Indexed: 06/07/2023]
Abstract
A high visibility Hong-Ou-Mandel (HOM) interference between two independently prepared photons plays an important role in various photonic quantum information processing. In a standard HOM experiment using photons generated by pulse-pumped spontaneous parametric down conversion (SPDC), larger detection time windows than the coherence time of photons have been employed for measuring the HOM visibility and/or drawing the HOM dip. If large amounts of stray photons continuously exist within the detection time windows, employing small detection time windows is favorable for reducing the effect of background noises. Especially, such a setup is helpful for the HOM experiment using continuous wave (cw)-pumped SPDC and the time-resolved coincidence measurement. Here we argue that the method for determining the HOM visibility used in the previous cw experiments tends to suffer from distortion arising from biased contribution of the background noises. We then present a new method with unbiased treatment of the cw backgrounds. By using this method, we experimentally demonstrate a high visibility HOM interference of two heralded telecom photons independently generated by SPDC with employing cw pump light. An observed HOM visibility is 0.87 ± 0.04, which is as high as those observed by using pulse-pumped SPDC photons.
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Xiong C, Zhang X, Liu Z, Collins MJ, Mahendra A, Helt LG, Steel MJ, Choi DY, Chae CJ, Leong PH, Eggleton BJ. Active temporal multiplexing of indistinguishable heralded single photons. Nat Commun 2016; 7:10853. [PMID: 26996317 DOI: 10.1038/ncomms10853] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 01/26/2016] [Indexed: 11/15/2022] Open
Abstract
It is a fundamental challenge in quantum optics to deterministically generate indistinguishable single photons through non-deterministic nonlinear optical processes, due to the intrinsic coupling of single- and multi-photon-generation probabilities in these processes. Actively multiplexing photons generated in many temporal modes can decouple these probabilities, but key issues are to minimize resource requirements to allow scalability, and to ensure indistinguishability of the generated photons. Here we demonstrate the multiplexing of photons from four temporal modes solely using fibre-integrated optics and off-the-shelf electronic components. We show a 100% enhancement to the single-photon output probability without introducing additional multi-photon noise. Photon indistinguishability is confirmed by a fourfold Hong–Ou–Mandel quantum interference with a 91±16% visibility after subtracting multi-photon noise due to high pump power. Our demonstration paves the way for scalable multiplexing of many non-deterministic photon sources to a single near-deterministic source, which will be of benefit to future quantum photonic technologies. Deterministically generated single photons are useful for quantum communications, but the processes that create such light are often non-deterministic. Here, the authors enhance the single-photon output probability by multiplexing photons from four temporal modes using fibre-integrated optics.
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