Field test of continuous-variable quantum key distribution with a true local oscillator

PHYSICAL REVIEW APPLIED(2024)

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Abstract
A continuous -variable quantum key distribution (CV QKD) using a true local (located at the receiver) oscillator (LO) has been proposed to remove any possibility of side -channel attacks associated with transmission of the LO as well as reduce the cross -pulse contamination. Here we report an implementation of true LO -CV QKD using "off -the -shelf" components and conduct QKD experiments using the fiber optical network at Oak Ridge National Laboratory. A phase reference and quantum signal are time multiplexed and then wavelength division multiplexed with the classical communications that "coexist" with each other on a single optical network fiber. This is the first demonstration of CV QKD with a receiver -based true LO over a deployed fiber network, a crucial step for its application in real -world situations.
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