Generation and measurement of arbitrary four-dimensional spatial entanglement between photons in multicore fibers

Hee Jung Lee; Hee Su Park

doi:doi:10.1364/PRJ.7.000019

Photonics Research, 2019, 7 (1): 01000019, Published Online: Feb. 21, 2019

Generation and measurement of arbitrary four-dimensional spatial entanglement between photons in multicore fibers

Hee Jung Lee ^1,2Hee Su Park ^1,*

Author Affiliations

¹ Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, South Korea

² Current address: Agency for Defense Development, Daejeon 34186, South Korea

Figures & Tables

Fig. 1. Schematic of the experimental setup. (a) Arrangement of the optical components used to generate and measure the entangled photon pairs between two multicore fibers. (b) Imaging configuration for the pump beam and photons coupled to the fiber cores (L=250 mm, f1=50 mm, f2=75 mm, and f3=15 mm). Inset: phase patterns on SLM0. SLM, spatial light modulator; L, lens; MCF, multicore fiber; Q, quarter-wave plate; H, half-wave plate; PBS, polarizing beam splitter; IF, interference filter; FC, fiber coupler; SMF, single-mode fiber.

下载图片查看原文

Fig. 2. Reconstructed density matrices by quantum state tomography: (a) d=2, (b) d=3, and (c) d=4.

下载图片查看原文

Fig. 3. Quantum correlations between the two-core superposition states, while changing the relative phase of the pump beam spots. Photon 1 in MCF1 is projected onto the state (|j⟩+|k⟩)/2. Photon 2 in MCF2 is projected onto (|j⟩+|k⟩)/2 (red circles) or (|j⟩+i|k⟩)/2 (black squares). The phase ϕ of the two-photon state component |k⟩|k⟩ is scanned from 0 to 2π by a relative phase of the relevant subsection pattern on SLM0. The coincidence counting period was 60 s. (a) j=0, k=1. (b) j=1, k=2. (c) j=2, k=3. (d) j=3, k=0.

下载图片查看原文

Fig. 4. Measured Bell-type parameter Sd (squares), compared with the limit by the local variable theories (triangles) and the theoretical values for the maximally entangled states (circles).

下载图片查看原文

Fig. 5. Relative amounts of the core-mode components and the Bell parameter S4 in entangled states (|0⟩|0⟩+γ|1⟩|1⟩+γ|2⟩|2⟩+|3⟩|3⟩)/2(1+γ2). Dashed lines denote the design values. (a) γ≈1.35. (b) γ≈1.00. (c) γ≈0.74. (d) γ≈0.32.

下载图片查看原文

Hee Jung Lee, Hee Su Park. Generation and measurement of arbitrary four-dimensional spatial entanglement between photons in multicore fibers[J]. Photonics Research, 2019, 7(1): 01000019.

Generation and measurement of arbitrary four-dimensional spatial entanglement between photons in multicore fibers

Fig. 2. Reconstructed density matrices by quantum state tomography: (a) d=2, (b) d=3, and (c) d=4.

Fig. 4. Measured Bell-type parameter Sd (squares), compared with the limit by the local variable theories (triangles) and the theoretical values for the maximally entangled states (circles).

Fig. 5. Relative amounts of the core-mode components and the Bell parameter S4 in entangled states (|0⟩|0⟩+γ|1⟩|1⟩+γ|2⟩|2⟩+|3⟩|3⟩)/2(1+γ2). Dashed lines denote the design values. (a) γ≈1.35. (b) γ≈1.00. (c) γ≈0.74. (d) γ≈0.32.

关于本站 Cookie 的使用提示

全站搜索

Generation and measurement of arbitrary four-dimensional spatial entanglement between photons in multicore fibers

Fig. 2. Reconstructed density matrices by quantum state tomography: (a) d=2, (b) d=3, and (c) d=4.

Fig. 4. Measured Bell-type parameter Sd (squares), compared with the limit by the local variable theories (triangles) and the theoretical values for the maximally entangled states (circles).

Fig. 5. Relative amounts of the core-mode components and the Bell parameter S4 in entangled states (|0⟩|0⟩+γ|1⟩|1⟩+γ|2⟩|2⟩+|3⟩|3⟩)/2(1+γ2). Dashed lines denote the design values. (a) γ≈1.35. (b) γ≈1.00. (c) γ≈0.74. (d) γ≈0.32.

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索