Quantum nondemolition microwave photon counter based on the cross-kerr nonlinearity of a junction embedded in a superconducting circuit

摘要

A technique relates to a microwave device (100). A pump resonator (102), at a first pump resonator end, is connected to both a dispersive nonlinear element (110) and a first stub (120A). The pump resonator (102), at a second pump resonator end, is capacitively coupled to a pump port (111), where the first stub (120A) is terminated in an open circuit. A quantum signal resonator (104), at a first quantum signal resonator end, is connected to both a dispersive nonlinear element (110) and a second stub (120B). The quantum signal resonator (104), at a second pump resonator end, is capacitively coupled to a signal port (113), where the second stub (120B) is connected to ground.