With the development of photonic quantum technologies, single photons have become key
for various applications including quantum communication and quantum computing …

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

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

We investigate the performance of entangled coherent states for quantum-enhanced phase
estimation. An exact analytical expression of quantum Fisher information is derived to show …

We present an improved phase estimation scheme employing entangled coherent states
and demonstrate that these states give the smallest variance in the phase parameter in …

Large-scale quantum effects have always played an important role in the foundations of
quantum theory. With recent experimental progress and the aspiration for quantum …

Nonlinear magnonics studies the nonlinear interaction between magnons and other
physical platforms (phonon, photon, qubit, spin texture) to generate novel magnon states for …

Superpositions of macroscopically distinct quantum states, introduced in Schrödinger's
famous Gedankenexperiment, are an epitome of quantum 'strangeness' and a natural tool …

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

We generate pulsed, two-mode squeezed states in a single spatiotemporal mode with mean
photon numbers up to 20. We directly measure photon-number correlations between the two …