Speeding up generation of photon Fock state in a superconducting circuit via counterdiabatic driving* *Project supported by the Key Research Project in Universities of Henan Province, China (Grant Nos. 19A140016 and 20B140016), the Natural Science Foundation of Henan Province, China (Grant Nos. 212300410388 and 212300410238), and the “316” Project Plan of Xuchang University.

Abstract

Optimal creation of photon Fock states is of importance for quantum information processing and state engineering. Here an efficient strategy is presented for speeding up generation of photon Fock state in a superconducting circuit via counterdiabatic driving. A transmon qubit is dispersively coupled to a quantized electrical field. We address a Λ-configuration interaction between the composite system and classical drivings. Based on two Gaussian-shaped drivings, a single-photon Fock state can be generated adiabatically. Instead of adding an auxiliary counterdiabatic driving, our concern is to modify these two Rabi drivings in the framework of shortcut to adiabaticity. Thus an accelerated operation with high efficiency can be realized in a much shorter time. Compared with the adiabatic counterpart, the shortcut-based operation is significantly insusceptible to decoherence effects. The scheme could offer a promising way to deterministically prepare photon Fock states with superconducting quantum circuits.