Research in quantum information processing has followed two different directions: the use of
discrete variables (qubits) and that of high-dimensional, continuous-variable Gaussian …

This review covers recent theoretical and experimental efforts to extend the application of
the continuous-variable quantum technology of light beyond" Gaussian" quantum states …

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

Quantum physics allows for entanglement between microscopic and macroscopic objects,
described by discrete and continuous variables, respectively. As in Schrödinger's famous cat …

Continuous-variable systems realized in quantum optics play a major role in quantum
information processing, and it is also one of the promising candidates for a scalable …

We have realized a high-detection-efficiency photon number resolving detector at an
operating wavelength of about 850 nm. The detector consists of a titanium superconducting …

We have created heralded coherent-state superpositions (CSSs) by subtracting up to three
photons from a pulse of squeezed vacuum light. To produce such CSSs at a sufficient rate …

In the field of continuous-variable quantum information processing, non-Gaussian states
with negative values of the Wigner function are crucial for the development of a fault-tolerant …

Schrödinger's cat originates from the famous thought experiment querying the
counterintuitive quantum superposition of macroscopic objects. As a natural extension …

Superconducting nanostrip photon detectors have been used as single-photon detectors,
which can discriminate only photons' presence or absence. It has recently been found that …