This review covers the latest developments in continuous-variable quantum-state
tomography of optical fields and photons, placing a special emphasis on its practical aspects …

Quantum key distribution provides secure keys with information-theoretic security ensured
by the principle of quantum mechanics. The continuous-variable version of quantum key …

Quantum key distribution (QKD) promises unconditional security in data communication and
is currently being deployed in commercial applications. Nonetheless, before QKD can be …

Quantum cryptography founded on the laws of physics could revolutionize the way in which
communication information is protected. Significant progresses in long-distance quantum …

The basic idea of squeezing can be understood by considering the quantum harmonic
oscillator, familiar from undergraduate quantum mechanics. Squeezing is best visualized by …

I propose an iterative expectation maximization algorithm for reconstructing the density
matrix of an optical ensemble from a set of balanced homodyne measurements. The …

We report the first continuous-variable quantum key distribution (CVQKD) experiment to
enable the creation of 1 Mbps secure key rate over 25 km standard telecom fiber in a coarse …

In an unseeded SU (1, 1) interferometer composed of two cascaded degenerate parametric
amplifiers, with direct detection at the output, we demonstrate a phase sensitivity overcoming …

In this paper, we present a fully fiber-based one-way quantum-key-distribution (QKD) system
implementing the Gaussian-modulated coherent-state (GMCS) protocol. The system …

We report preparation and characterization of coherent superposition states t| 0>+ α| 1> of
the electromagnetic field by conditional measurements on a beam splitter. This state is …