[15a-4D-1~13] 3.10 Optical quantum physics and technologies

[15a-4D-8] Violation of the CGLMP Inequality with 4 Dimensional Time-bin Entanglement

〇(M2)Takuya Ikuta^1,2, Hiroki Takesue¹ (1.NTT Basic Research Labs, 2.Osaka Univ.)

Keywords:quantum entanglement,Bell inequality,high dimension

Recently, experiments of the CGLMP inequality, a Bell-type inequality for high-dimensional quantum entanglement, have been performed by using photonic entanglement based on orbital angular momentum or time-energy uncertainty. Here we report generation and observation of 4 dimensional time-bin entanglement. We implemented projection measurements for the CGLMP inequality test with cascaded delay Mach-Zehnder interferometers, and successfully observed a clear violation of the CGLMP inequality by 18 standard deviations.