Acousto-optic modulator-based bi-frequency interferometer for quantum technology

Wenqi Li; Qiqi Deng; Xueshi Guo; Xiaoying Li

doi:10.3788/COL202422.022703

Journals >Chinese Optics Letters >Volume 22 >Issue 2 >Page 022703 > Article

Chinese Optics Letters
Vol. 22, Issue 2, 022703 (2024)

Acousto-optic modulator-based bi-frequency interferometer for quantum technology | Editors' Pick

Wenqi Li, Qiqi Deng, Xueshi Guo^*, and Xiaoying Li^**

Author Affiliations

College of Precision Instrument and Opto-Electronics Engineering, Key Laboratory of Opto-Electronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China

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DOI: 10.3788/COL202422.022703 Cite this Article Set citation alerts

Wenqi Li, Qiqi Deng, Xueshi Guo, Xiaoying Li. Acousto-optic modulator-based bi-frequency interferometer for quantum technology[J]. Chinese Optics Letters, 2024, 22(2): 022703 Copy Citation Text

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Abstract

We demonstrate a high-performance acousto-optic modulator-based bi-frequency interferometer, which can realize either beating or beating free interference for a single-photon level quantum state. Visibility and optical efficiency of the interferometer are

(99.5 \pm 0.2) %

and

(95 \pm 1) %

, respectively. The phase of the interferometer is actively stabilized by using a dithering phase-locking scheme, where the phase dithering is realized by directly driving the acousto-optic modulators with a specially designed electronic signal. We further demonstrate applications of the interferometer in quantum technology, including bi-frequency coherent combination, frequency tuning, and optical switching. These results show the interferometer is a versatile device for multiple quantum technologies.

Keywords

acousto-optic modulator bi-frequency interferometer quantum manipulation quantum optics

\hat{c} = t {\hat{b}}_{ω 2} + e^{i θ} r {\hat{a}}_{ω 1 - Ω}, \hat{d} = t {\hat{a}}_{ω 1} - e^{- i θ} r {\hat{b}}_{ω 2 + Ω},

(1)

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{\hat{e}}_{ω + Ω} = t_{1}^{'} {\hat{a}}_{ω + Ω} - r_{1}^{'} {\hat{b}}_{ω + Ω}, {\hat{f}}_{ω} = r_{2}^{'} {\hat{a}}_{ω} + t_{2}^{'} {\hat{b}}_{ω},

(2)

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t_{1}^{'} = t_{1} t_{2} e^{i φ} - r_{1} r_{2} e^{i (θ_{1} - θ_{2})}, r_{1}^{'} = r_{1} t_{2} e^{i (φ - θ_{1})} + t_{1} r_{2} e^{- i θ_{2}}, t_{2}^{'} = t_{1} t_{2} - r_{1} r_{2} e^{i (θ_{2} - θ_{1} + φ)}, r_{2}^{'} = r_{1} t_{2} e^{i θ_{1}} + t_{1} r_{2} e^{i (θ_{2} + φ)} .

(3)

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I_{out} = ⟨ α | {\hat{e}}_{ω + Ω}^{†} {\hat{e}}_{ω + Ω} | α ⟩ = \frac{1}{2} [1 + \cos (ϕ)] I_{in},

(4)

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I_{out}^{'} = \frac{η}{2} [1 + V \cos (Δ ω T + ϕ)] I_{in},

(5)

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Wenqi Li, Qiqi Deng, Xueshi Guo, Xiaoying Li. Acousto-optic modulator-based bi-frequency interferometer for quantum technology[J]. Chinese Optics Letters, 2024, 22(2): 022703

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