Illusion optics in chaotic light

Abstract

The time-reversal process provides the possibility to counteract the time evolution of a physical system. Recent research has shown that such a process can occur in the first-order field correlation of chaotic light and result in the spatial interference and phase-reversal diffraction in an unbalanced interferometer. Here we report experimental investigations on the invisibility cloak and illusion phenomena in chaotic light. In an unbalanced interferometer illuminated by thermal light, we have observed the cloak effect and the optical transformation of one object into another object. The experimental results can be understood by the phase-reversal diffraction, and they demonstrate the theoretical proposal of similar effects in complementary media.

Entanglement on macroscopic scales in a resonant-laser-field-excited atomic ensemble

“…Appendix D: Diagonalisation of the operator V + V † for V given by equation (16) The operator (16) can be written in the form…”

“…To study more quantitatively long-range entanglement, we consider two regions of characteristic size L, separated by a large distance D ≫ k 0 L 2 , and assume that, in these areas, the laser beam is essentially a plane wave of wave vector K. Systems A and B consist of the atoms lying in these regions, see Fig.1. In this case, equations (5), (13), and (14), give (16) where w µ = exp(iK · r µ − iωt), θ is the angle between d and the approximate line joining A and B, and |μ = exp(−ik 0 e · r µ )|µ AB with e the unit vector pointing from A to B. Noting that this operator can be written in terms of four kets, one finds two negative eigenvalues λ (2) q .…”

Einstein-Podolsky-Rosen steering in Gaussian weighted graph states

“…A graph state is described by a mathematical graph, that is a set of vertices connected by edges [27][28][29]. A vertex represents a physical system, e.g., a qubit or a continuous variable (CV) qumode.…”

Density-functional theory for the spin-1 bosons in a one-dimensional harmonic trap

“…Based on (46) and (47) Kuhn et al give the ground state phase diagram and find that the singlet pairs and unpaired bosons may form a twocomponent Luttinger liquid in the strong coupling regime [12]. When the interaction approaches infinitely strong, with the limit values of chemical potential (31,32) and the normalization conditions (33,34), we can solve (46, 47) to obtain the following half-ellipse-like density profiles…”

“…In the three-dimensional (3D) case, the spin-dependent spinexchange interactions are much weaker than the spinindependent short-range density-density interactions, for example, the ratio of them are c 2 /c 0 (Na) = 0.03 [20] and c 2 /c 0 (Rb) = −0.005 [21] respectively. The groundstate wavefunction is represented by a spinor wavefunction which minimizes the free energy [22][23][24] and the spin-exchange interactions give rise to a rich variety of phenomena such as spin domains [17], textures [22], spin mixing dynamics [25][26][27][28], and fragmentation of condensate [29][30][31] etc. On the other hand, 1D systems can be realized by confining the cold atoms in strong anisotropic traps where the motion of atoms is effectively 1D [13][14][15][32][33][34][35][36].…”