Quantum key distribution with simply characterized light sources

N-dimensional measurement-device-independent quantum key distribution with N + 1 un-characterized sources: zero quantum-bit-error-rate case

We study N-dimensional measurement-device-independent quantum-key-distribution protocol where one checking state is used. Only assuming that the checking state is a superposition of other N sources, we show that the protocol is secure in zero quantum-bit-error-rate case, suggesting possibility of the protocol. The method may be applied in other quantum information processing.

Non-Poissonian statistics from Poissonian light sources with application to passive decoy state quantum key distribution.

We propose a method to prepare different non-Poissonian signal pulses from sources of Poissonian photon number distribution, using only linear optical elements and threshold photon detectors. This method allows a simple passive preparation of decoy states for quantum key distribution. We show that the resulting key rates are comparable with the performance of active choices of intensities of Po...

Measurement-device-independent quantum key distribution with uncharacterized qubit sources

Security aspects of quantum key distribution with sub-Poisson light

The security of quantum key distribution with sub-Poisson light sources is investigated. It is shown that a quantitative analysis of the security of such sources requires only two measured values, the efficiency and second-order correlation. These two numbers represent figures of merit, which characterize the performance of such light sources. We show that sub-Poisson light sources can offer si...

A passive transmitter for quantum key distribution with coherent light

Marcos Curty, Marc Jofre, Valerio Pruneri, and Morgan W. Mitchell 1 Escuela de Ingenieŕıa de Telecomunicación, Department of Signal Theory and Communications, University of Vigo, Campus Universitario, 36310 Vigo, Pontevedra, Spain 2 ICFO-Institut de Ciències Fotòniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain 3 ICREA-Institució Catalana de Recerca i Estudis Avançats...