Related papers: Nonreciprocal interaction and entanglement between two superconducting qubits

Nonreciprocal interaction and entanglement between two superconducting qubits

URL: http://arxiv.org/abs/2411.06775v1
Date: Mon, 11 Nov 2024 08:05:47 GMT
Title: Nonreciprocal interaction and entanglement between two superconducting qubits
Authors: Yu-Meng Ren, Xue-Feng Pan, Xiao-Yu Yao, Xiao-Wen Huo, Jun-Cong Zheng, Xin-Lei Hei, Yi-Fan Qiao, Peng-Bo Li,
Abstract summary: Nonreciprocal interaction between two spatially separated subsystems plays a crucial role in signal processing and quantum networks. We propose an efficient scheme to achieve nonreciprocal interaction and entanglement between two qubits by combining coherent and dissipative couplings. Applying a drive field to one of the qubits can stabilize the system into a nonreciprocal steady-state entangled state.
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Abstract: Nonreciprocal interaction between two spatially separated subsystems plays a crucial role in signal processing and quantum networks. Here, we propose an efficient scheme to achieve nonreciprocal interaction and entanglement between two qubits by combining coherent and dissipative couplings in a superconducting platform, where two coherently coupled transmon qubits simultaneously interact with a transmission line waveguide. The coherent interaction between the transmon qubits can be achieved via capacitive coupling or via an intermediary cavity mode, while the dissipative interaction is induced by the transmission line via reservoir engineering. With high tunability of superconducting qubits, their positions along the transmission line can be adjusted to tune the dissipative coupling, enabling to tailor reciprocal and nonreciprocal interactions between the qubits. A fully nonreciprocal interaction can be achieved when the separation between the two qubits is $(4n+3)\lambda_{0} /4$, where $n$ is an integer and $\lambda_{0}$ is the photon wavelength. This nonreciprocal interaction enables the generation of nonreciprocal entanglement between the two transmon qubits. Furthermore, applying a drive field to one of the qubit can stabilize the system into a nonreciprocal steady-state entangled state. Remarkably, the nonreciprocal interaction in this work does not rely on the presence of nonlinearity or complex configurations, which has more potential applications in designing nonreciprocal quantum devices, processing quantum information, and building quantum networks.

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