Fig. 1: Schematic of the experimental setup.
From: Large array of Schrödinger cat states facilitated by an optical waveguide
Two 150-mm achromatic lenses are used to couple all the beams into the fibre with 70% coupling efficiency. The π-polarised optical pump beam incident from the side of the fibre can efficiently prepare atoms in the |F = 2, m = 0> state with >90% efficiency. Each lattice site in the fibre represents a harmonic oscillator potential for atoms (red filled circles). The coloured Gaussian wave packets in the potential illustrate the coherent harmonic oscillator states that are entangled with the spin states. The inset shows a near-field image of the waveguide mode. PBS: polarising beam splitter. NPBS nonpolarising beam splitter, NF notch filter, APD avalanche photodiode.
