Figure 1
From: Quantum interferometry with three-dimensional geometry
(a) 3D structure of tritter.(b) 3-dimensional structure of quarter. (c) Geometry showing the direct coupling between the three modes of the tritter. (d) Geometry showing the direct coupling between the four modes of the quarter. (e) Indirect coupling between the four modes of the quarter by means of one ancillary mode. (f) 3-mode interferometer built by using two cascaded tritters. (g) 4-mode interferometer built by cascading two quarter devices. (f)–(g) φ: phase to be measured. ψ: additional phase for adaptive phase estimation.
