53 citations · 159 across the 11 of their papers we have counts for
11 papers
Enhancing the stimulated emission of polarization-entangled photons using passive optical components
Ryo Nozaki, Yoshiro Sato, Yoshitaka Shimada +7
Bright sources of polarization-entangled photon pairs are essential components for quantum information technologies. In general, it is necessary to introduce a resonator that combi…
su(N) Mermin-Ho relation
Emi Yukawa
The Mermin-Ho relation expresses the vorticity of a coreless su(2) vortex in terms of the spin-1 or l vector which characterizes fully polarized superfluid textures. We generalize…
Morphological Superfluid in a Nonmagnetic Spin-2 Bose-Einstein Condensate
Emi Yukawa, Masahito Ueda
The two known mechanisms for superflow are the gradient of the U(1) phase and the spin-orbit-gauge symmetry. We find the third mechanism, namely a spatial variation of the order-pa…
Nonholonomy of order parameters and su(3) vortices in spin-1 Bose-Einstein condensates
Emi Yukawa, Masahito Ueda
A generalized Mermin-Ho relation for a spin-1 BEC is derived, which is applicable to vortices regardless of the symmetry and spin polarization of the order parameter. The obtained…
Fast macroscopic-superposition-state generation by coherent driving
Emi Yukawa, G. J. Milburn, Kae Nemoto
We propose a scheme to generate macroscopic superposition states in spin ensembles, where a coherent driving field is applied to accelerate the generation of macroscopic superposit…
Classification of spin and multipolar squeezing
Emi Yukawa, Kae Nemoto
We investigate various types of squeezing in a collective su(2J+1) system consisting of spin-J particles (J>1/2). We show that the squeezing in the collective su(2J+1) system can b…