Quasiparticle interferometer controlled by quantum-correlated Andreev reflection

We propose a quasiparticle interferometer and give a theoretical analysis for it. It consists of a Josephson junction (JJ) and a Y junction composed of normal-electron waveguides. The interferometer should enable us to confirm experimentally the phase interaction between a quasiparticle and a superconducting state at the superconductor--normal-metal (SN) interface. This interaction is caused by Andreev reflection. The supercurrent through the JJ modifies, by Andreev reflection, the interference of a quasiparticle in the waveguide and affects the normal resistance of the waveguide. The dependence of the resistance on the phase difference of JJ is determined by the characteristics of the Y junction and the normal reflection at the SN interface.