Solid-State Qubit as an On-Chip Controller for Non-Classical Field States

A basic element of a quantum network based on two single-mode waveguides is proposed with different frequencies connected by a solid-state qubit. Using a simple example of a possible superconducting implementation, the usefulness of the simplifications used in the general theoretical consideration has been justified. The non-classical field in a single-mode with a frequency of omega 1$\omega _1$ is fed to the input of a qubit controller and transformed into a non-classical field in an output single-mode with a frequency of omega 2$\omega _2$. The interface can establish a quantum connection between solid-state and photonic flying qubits with adjustable pulse shapes and carrier frequencies. This allows quantum information to be transferred to other superconducting or atomic-based quantum registers or chips. The peculiarities of the wave-qubit interactions are described, showing how they help to control the quantum state of the non-classical field. On this basis, the operating principles of solid-state and flying qubits for the future quantum information platforms are considered. Current research in quantum matter is strongly focused on quantum communication and the quantum internet. The manuscript discusses a fundamental element of a quantum network consisting of two single-mode resonators of different frequencies connected by a solid-state qubit. The non-classical field in a single-mode resonator operating at frequency omega 1$\omega _1$ is directed to the input of a qubit controller and subsequently converted to a non-classical field in an output single-mode resonator operating at frequency omega 2$\omega _2$. This interface provides a quantum connection between solid-state and photonic flying qubits, offering tunable pulse shapes and carrier frequencies. image