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Coherent optical processing of passive signals

B. V. K. Vijaya Kumar

Published Jan 1, 1980• 0 citations
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Marcos Curty, Xiongfeng Ma, Hoi‐Kwong Lo +1 more

In a typical optical implementation of the Bennett-Brassard 1984 (so-called BB84) quantum key distribution protocol, the sender uses an active source to produce the required signal states.While active state preparation of BB84 signals is a simple and elegant solution in principle, in practice passive state preparation might be desirable in some scenarios, for instance, in those experimental setups operating at high transmission rates.Passive devices usually involve parametric down-conversion.Here we show that coherent light is also suitable for passive generation of BB84 signal states.Our method does not require any externally-driven element, but only linear optical components and photodetectors.The resulting key rate is similar to the one delivered by an active source.

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Nonlinear-optical signal processing

IEEE Journal of Quantum Electronics•Sep 1, 2010•0 citations
In this paper, we explore the general principles of time-division multiple-access passive optical networks (PON) through the lens of quantum light signals. We investigate the optimal quantum receiver for various quantum light signals and delve into the fundamental constraints imposed by their quantum nature. This paper evaluates the optimal error probability for the Fock, coherent and phase-randomized coherent states. Furthermore, we investigated the power splitter/combiner channel, which is the main element in a PON, from the quantum viewpoint using the scattering matrix formalism. We demonstrated that under the low-loss condition, the error probability of the Fock quantum passive optical network (QPON) can surpass the coherent QPON.
In this paper, we explore the time-division multipleaccess passive optical networks (PON) through the lens of quantum light signals. We investigate the optimal quantum receiver for various quantum light signals and delve into the fundamental constraints imposed by their quantum nature. This paper evaluates the optimal error probability for the Fock (number) and coherent (Glauber) states. We demonstrated that under the low-loss condition, the error probability of the Fock quantum passive optical network (QPON) can surpass the coherent QPON. Furthermore, we investigated the power splitter/combiner channel, which is the main element in a PON, from the quantum viewpoint using the scattering matrix formalism.
In a typical optical implementation of the Bennett-Brassard 1984 (so-called BB84) quantum key distribution protocol, the sender uses an active source to produce the required signal states.While active state preparation of BB84 signals is a simple and elegant solution in principle, in practice passive state preparation might be desirable in some scenarios, for instance, in those experimental setups operating at high transmission rates.Passive devices usually involve parametric down-conversion.Here we show that coherent light is also suitable for passive generation of BB84 signal states.Our method does not require any externally-driven element, but only linear optical components and photodetectors.The resulting key rate is similar to the one delivered by an active source.