Abstract
Conventional wisdom suggests that realistic quantum repeaters will require quasi-deterministic sources of entangled photon pairs. In contrast, we here study a quantum repeater architecture that uses simple parametric down-conversion sources, as well as frequency-multiplexed multimode quantum memories and photon-number-resolving detectors. We show that this approach can significantly extend quantum communication distances compared to direct transmission. This shows that important trade-offs are possible between the different components of quantum repeater architectures.
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Acknowledgments
This work was supported by Alberta Innovates Technology Futures (AITF), the National Engineering and Research Council of Canada (NSERC), the DARPA Quiness program subaward contract number SP0020412-PROJ0005188, under prime contract number W31P4Q-13-1-0004. W.T. is a senior fellow of the Canadian Institute for Advanced Research. We thank Chris Fuchs for useful discussions on modeling, Matt Shaw for useful discussions on detectors and Jonas Schmöle for graphical support.
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This paper is part of the topical collection “Quantum Repeaters: From Components to Strategies” guest edited by Manfred Bayer, Christoph Becher and Peter van Loock.
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Krovi, H., Guha, S., Dutton, Z. et al. Practical quantum repeaters with parametric down-conversion sources. Appl. Phys. B 122, 52 (2016). https://doi.org/10.1007/s00340-015-6297-4
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DOI: https://doi.org/10.1007/s00340-015-6297-4