1 Institute for Quantum Information & State Key Laboratory of High Performance Computing, College of Computer, National University of Defense Technology, Changsha 410073, China 2 National Innovation Institute of Defense Technology, AMS, Beijing 100071, China 3 National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, China
We propose an on-chip reconfigurable micro-ring to engineer the spectral-purity of photons. The micro-ring resonator is designed to be coupled by one or two asymmetric Mach–Zehnder interferometers and the coupling coefficients hence the quality-factors of the pump and the converted photons can be dynamically changed by the interferometer’s internal phase-shifter. We calculate the joint-spectrum function and obtain the spectral-purity of photons and Schmidt number under different phases. We show that it is a dynamical method to adjust the spectral-purity and can optimize the spectral-purity of photons up to near 100%. The condition for high-spectral-purity photons is ensured by the micro-ring itself, so it overcomes the trade-off between spectral purity and brightness in the traditional post-filtering method. This scheme is robust to fabrication variations and can be successfully applied in different fabrication labs and different materials. Such high-spectral-purity photons will be beneficial for quantum information processing like Boson sampling and other quantum algorithms.
Received: 21 September 2020
Revised: 21 September 2020
Accepted manuscript online: 24 September 2020
Fund: the National Basic Research Program of China (Grant Nos. 2017YFA0303700 and 2019YFA0308700), the National Natural Science Foundation of China (Grant Nos. 61632021 and 11690031), and the Open Funds from the State Key Laboratory of High Performance Computing of China (HPCL, National University of Defense Technology).
Corresponding Authors: †These authors contributed equally to this work. ‡Corresponding author. E-mail: pingxu520@nju.edu.cn
Cite this article:
Pingyu Zhu(朱枰谕), Yingwen Liu(刘英文), Chao Wu(吴超), Shichuan Xue(薛诗川), Xinyao Yu(于馨瑶), Qilin Zheng(郑骑林), Yang Wang(王洋), Xiaogang Qiang(强晓刚), Junjie Wu(吴俊杰), and Ping Xu(徐平) Near 100% spectral-purity photons from reconfigurable micro-rings 2020 Chin. Phys. B 29 114201
Fig. 1.
The theoretical spectral purity as a function of Qs/i/Qp.[24]
Fig. 2.
Schematic of (a) a common single or double-side-coupled micro-ring resonator and (b) a single-AMZI-coupled micro-ring resonator. (c) The resonance strength of the single-AMZI-coupled micro-ring and the AMZIs’ efficient cross-coupling strength with different settings of the phase φ.
Fig. 3.
Simulated spectral purity of the idler photons from the single-AMZI-coupled micro-ring resonator as a function of the phase φ.
Fig. 4.
Simulated signal–idler joint spectral function profiles of the single-AMZI-coupled micro-ring resonator in the cases of (a) φ = 3π/4, (b) π/2, (c) π/4.
Fig. 5.
(a) Schematic of a dual-AMZI-coupled micro-ring resonator. (b) The resonance strength of the dual-AMZI-coupled micro-ring and the two AMZIs’ efficient cross-coupling strength with different settings of the phases φ1 and φ2.
Fig. 6.
Simulated spectral purity of the idler photons from the dual-AMZI-coupled micro-ring resonator as a function of the phase φ2.
Fig. 7.
Simulated signal–idler joint spectral function profiles of the dual-AMZI-coupled micro-ring resonator in the cases of (a) φ2 = π, (b) 3π/4, (c) π/2, and (d) π/4.
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