Two-photon interferences on a silica-on-silicon chip with telecom-band photon pairs generated in a fiber.

We report two-photon interferences on a silica-on-silicon chip of Mach-Zehnder interferometer using telecommunication-band correlated photon pairs. The photon pairs were generated by spontaneous four-waving mixing process in a dispersion-shifted fiber. The integrated chip, which was fabricated by standard silica-on-silicon planar lightwave circuit technology, contained a Mach-Zehnder interferometer with a thermo-optic phase shifter. The insertion loss of the interferometer was less than 1 dB. We demonstrated two-photon interferences with both degenerate- and non-degenerate-frequency photon pairs on the Mach-Zehnder interferometer chip. A high fringe visibility was achieved in the interference with nondegenerate-frequency photons. Properties of quantum interference were demonstrated in the interference with degenerate-frequency photon pairs, which is an important way to manipulate the quantum state. These results show great potential of silica-on-silicon photonic chips in applications for the fiber-chip scheme in quantum networks.

[1]  Jeremy L O'Brien,et al.  Heralding two-photon and four-photon path entanglement on a chip. , 2010, Physical review letters.

[2]  Wei Zhang,et al.  Experimental long-distance quantum secure direct communication. , 2017, Science bulletin.

[3]  A. Politi,et al.  Manipulation of multiphoton entanglement in waveguide quantum circuits , 2009, 0911.1257.

[4]  Junming An,et al.  Monolithic integration of a 16-channel VMUX on SOI platform , 2015 .

[5]  Sae Woo Nam,et al.  High-efficiency, ultra low-noise all-fiber photon-pair source. , 2008, Optics express.

[6]  Yasunobu Nakamura,et al.  Quantum computers , 2010, Nature.

[7]  S. Kurimura,et al.  Bright narrowband source of photon pairs at optical telecommunication wavelengths using a type-II periodically poled lithium niobate waveguide. , 2007, Optics express.

[8]  Akio Yoshizawa,et al.  Distribution of polarization-entangled photonpairs produced via spontaneous parametric down-conversion within a local-area fiber network: theoretical model and experiment. , 2008, Optics express.

[9]  Lu Zhang,et al.  Superconducting nanowire single photon detector with on-chip bandpass filter. , 2014, Optics express.

[10]  Wang Ruopeng,et al.  Quantum analysis on the four-photon interference , 2008 .

[11]  Jun-Lin Li,et al.  Two-step quantum secure direct communication scheme with frequency coding , 2017 .

[12]  C. M. Natarajan,et al.  On-chip quantum interference between silicon photon-pair sources , 2013, Nature Photonics.

[13]  Guang-Can Guo,et al.  On-chip generation of time-and wavelength-division multiplexed multiple time-bin entanglement. , 2018, Optics express.

[14]  N. Gisin,et al.  Highly efficient photon-pair source using periodically poled lithium niobate waveguide , 2000 .

[15]  Wei Zhang,et al.  Fiber-based frequency-degenerate polarization entangled photon pair sources for information encoding. , 2016, Optics express.

[16]  Guang-Can Guo,et al.  On-chip coherent conversion of photonic quantum entanglement between different degrees of freedom , 2016, Nature Communications.

[17]  J. O'Brien,et al.  Universal linear optics , 2015, Science.

[18]  Jun Chen,et al.  All-fiber photon-pair source for quantum communications: Improved generation of correlated photons. , 2004 .

[19]  P. Kumar,et al.  All-fiber photon-pair source for quantum communications , 2002, IEEE Photonics Technology Letters.

[20]  A. Politi,et al.  Silica-on-Silicon Waveguide Quantum Circuits , 2008, Science.

[21]  C. M. Natarajan,et al.  Quantum interference and manipulation of entanglement in silicon wire waveguide quantum circuits , 2012, 1201.6537.

[22]  Yan Li,et al.  CW-pumped telecom band polarization entangled photon pair generation in a Sagnac interferometer. , 2015, Optics express.

[23]  H. Weinfurter,et al.  Entanglement-based quantum communication over 144km , 2007 .

[24]  Multiplexed entangled photon-pair sources for all-fiber quantum networks , 2016, 1605.04701.

[25]  Jun Chen,et al.  Fiber-based telecom-band degenerate-frequency source of entangled photon pairs. , 2006, Optics letters.

[26]  Yin-Hai Li,et al.  On-Chip Multiplexed Multiple Entanglement Sources in a Single Silicon Nanowire , 2017 .

[27]  D. Deutsch.  Quantum theory, the Church–Turing principle and the universal quantum computer , 1985, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[28]  Todd A. Brun,et al.  Quantum Computing , 2011, Computer Science, The Hardware, Software and Heart of It.

[29]  David P. DiVincenzo,et al.  Quantum information and computation , 2000, Nature.

[30]  Dan Lu,et al.  C-band fundamental/first-order mode converter based on multimode interference coupler on InP substrate* , 2016 .

[31]  H. Weinfurter,et al.  Free-Space distribution of entanglement and single photons over 144 km , 2006, quant-ph/0607182.