Toward a reconfigurable quantum network enabled by a broadband entangled source

Eric Y. Zhu; Costantino Corbari; Alexey Gladyshev; Peter G. Kazansky; Hoi-Kwong Lo; Li Qian

doi:10.1364/JOSAB.36.0000B1

Toward a reconfigurable quantum network enabled by a broadband entangled source

Eric Y. Zhu, Costantino Corbari, Alexey Gladyshev, Peter G. Kazansky, Hoi-Kwong Lo, and Li Qian

Journal of the Optical Society of America B
Vol. 36,
Issue 3,
pp. B1-B6
(2019)
•https://doi.org/10.1364/JOSAB.36.0000B1

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Eric Y. Zhu, Costantino Corbari, Alexey Gladyshev, Peter G. Kazansky, Hoi-Kwong Lo, and Li Qian, "Toward a reconfigurable quantum network enabled by a broadband entangled source," J. Opt. Soc. Am. B 36, B1-B6 (2019)

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About this Article
History
- Original Manuscript: October 2, 2019
- Revised Manuscript: November 9, 2018
- Manuscript Accepted: November 12, 2018
- Published: January 2, 2019

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Abstract

We present a proof-of-principle experimental demonstration of a reconfigurable entanglement distribution scheme utilizing a poled fiber-based source of broadband polarization-entangled photon pairs and dense wavelength-division multiplexing. A large bandwidth ( $> 90 nm$ , centered at 1555 nm) and highly spectrally correlated nature of the entangled source can be exploited to allow for the generation of more than 25 frequency-conjugate entangled pairs when aligned to the standard 200 GHz ITU grid. In this work, three frequency-conjugate entangled pairs are used to demonstrate quantum key distribution, with the wavelength-selective switching done manually. The entangled pairs are delivered over 40 km of actual fiber, and an estimated secure key rate of up to 20 bits/s per bi-party is obtained.

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$λ_{s}$ (nm)	1553.3	1533.3	1518.7
$λ_{i}$ (nm)	1556.6	1577.1	1593.0
Tangle	$0.967 \pm 0.002$	$0.964 \pm 0.004$	$0.952 \pm 0.008$
Fidelity to $Ψ^{+}$	$0.989 \pm 0.001$	$0.989 \pm 0.001$	$0.985 \pm 0.001$

$λ_{s}$ (nm)	1553.3	1533.3	1518.7
$λ_{i}$ (nm)	1556.6	1577.1	1593.0
Pairs/pulse	$8.9 \times 10^{- 3}$	$7.6 \times 10^{- 3}$	$5.2 \times 10^{- 3}$
Generated per channel
System Loss	$19.4 + 19.5$	$18.7 + 19.8$	$18.7 + 20.7$
$Signal + Idler$ : (dB)
Sifted key	$32.5 \pm 0.7$	$29.4 \pm 0.7$	$16.3 \pm 0.5$
Rate (bits/s) ( $\pm 3 σ$ )
QBER ( $\pm 3 σ$ ):
$e_{H} (%)$	$2.35 \pm 0.51$	$1.68 \pm 0.45$	$4.72 \pm 1.0$
$e_{D} (%)$	$2.15 \pm 0.48$	$2.23 \pm 0.51$	$7.22 \pm 1.2$
Secure key	$20.5 \pm 1.0$	$19.7 \pm 1.0$	$4.0 \pm 0.9$
Rate (bits/s) ( $\pm 3 σ$ )

$λ_{s}$ (nm)	1553.3	1533.3	1518.7
$λ_{i}$ (nm)	1556.6	1577.1	1593.0
Tangle	$0.967 \pm 0.002$	$0.964 \pm 0.004$	$0.952 \pm 0.008$
Fidelity to $Ψ^{+}$	$0.989 \pm 0.001$	$0.989 \pm 0.001$	$0.985 \pm 0.001$

$λ_{s}$ (nm)	1553.3	1533.3	1518.7
$λ_{i}$ (nm)	1556.6	1577.1	1593.0
Pairs/pulse	$8.9 \times 10^{- 3}$	$7.6 \times 10^{- 3}$	$5.2 \times 10^{- 3}$
Generated per channel
System Loss	$19.4 + 19.5$	$18.7 + 19.8$	$18.7 + 20.7$
$Signal + Idler$ : (dB)
Sifted key	$32.5 \pm 0.7$	$29.4 \pm 0.7$	$16.3 \pm 0.5$
Rate (bits/s) ( $\pm 3 σ$ )
QBER ( $\pm 3 σ$ ):
$e_{H} (%)$	$2.35 \pm 0.51$	$1.68 \pm 0.45$	$4.72 \pm 1.0$
$e_{D} (%)$	$2.15 \pm 0.48$	$2.23 \pm 0.51$	$7.22 \pm 1.2$
Secure key	$20.5 \pm 1.0$	$19.7 \pm 1.0$	$4.0 \pm 0.9$
Rate (bits/s) ( $\pm 3 σ$ )

Abstract

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Figures (5)

Tables (2)

Equations (5)

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