U(2) invariant squeezing properties of pair coherent states

Uhlmann fidelity between two-mode Gaussian states

Uhlmann's geometric phase in presence of isotropic decoherence

Uhlmann's parallelism in quantum estimation theory

Ultimate crack and lack of any security in the statistical key exchange protocol with random signals and feedback

Ultimate decoherence border for matter-wave interferometry

Ultimate Energy Densities for Electromagnetic Pulses

Ultimate field-free molecular alignment by combined adiabatic-impulsive field design

Ultimate limits to quantum metrology and the meaning of the Heisenberg limit

Ultimate physical limits to computation

Ultimate quantum bounds on mass measurements with a nano-mechanical oscillator

Ultimate sensitivity of precision measurements with Gaussian quantum light : a multi-modal approach

Ultra fast quantum key distribution over a 97 km installed telecom fiber with wavelength-division multiplexing clock synchronization

Ultra--low noise differential AC-coupled photodetector for sensitive pulse detection applications

Ultra-bright biphoton emission from an atomic vapor based on Doppler-free four-wave-mixing and collective emission

Ultra-bright source of polarization-entangled photons

Ultra-Broadband Coherence-Domain Imaging Using Parametric Downconversion and Superconducting Single-Photon Detectors at 1064 nm

Ultra-broadband Heteronuclear Hartmann-Hahn polarization transfer

Ultra-broadband photon pair preparation by spontaneous four wave mixing in dispersion-engineered optical fiber

Ultra-cold mechanical resonators coupled to atoms in an optical lattice