Year: 2025
Type: article
Abstract: We propose a scheme for realizing a deterministic two-photon controlled-$Z$ (cz) gate based on variants of the two-photon quantum Rabi model, which is feasible within the framework of circuit QED. We begin by utilizing the two-photon interaction to implement the nonlinear sign gate and subsequently we construct the cz gate following the Knill-Laflamme-Milburn scheme [Nature (London) 409, 46 (2001)]. We consider three different regimes: the strong-coupling regime, the perturbative ultrastrong-coupling regime, and the large-detuning regime. Our results indicate that the cz gate operates fast with high fidelity. We also show that the photonic state in the waveguide can be input into the circuit QED system through a variable coupler and released after interaction with almost the same waveform except for a $\ensuremath{\pi}$-phase shift. Our scheme offers a suitable approach for achieving fast and deterministic two-photon quantum gates via light-matter interactions.
Source: Physical Review A
Authors: Jia-Cheng Tang, Jin Zhao, Haitao Yang, Junlong Tian, Pinghua Tang, Shuai-Peng Wang, Lucas Lamata, Jie Peng
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
Funders: European Commission, National Natural Science Foundation of China, Natural Science Foundation of Hunan Province, Ministerio de Ciencia e Innovación, Scientific Research Foundation of Hunan Provincial Education Department, European Regional Development Fund, Agencia Estatal de Investigación, National Key Research and Development Program of China
OpenAlex ID: W4410032157