Generation of Broadband Frequency Entangled Biphotons for Quantum Clock Synchronization

  • Run-ai Quan
  • Rui-fang Dong
  • Fei-yan Hou
  • Yun Bai
  • Yu Zhang
  • Tao Liu
  • Shou-gang Zhang
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 160)

Abstract

Frequency entangled biphotons based on spontaneous parametric down conversion (SPDC) of nonlinear crystal are widely used in Quantum clock synchronization protocols. The time-correlation width of the entangled source determines the accuracy of the attainable synchronization, which relies on the spectral bandwidth of the generated biphotons. We theoretically investigate the generation of frequency anti-correlated biphotons from chirped periodically-poled potassium titanyl phosphate (C-PPKTP). It is demonstrated that an ultra-broadband entangled biphoton source with a width of 857 nm was obtained, by using a 10 mm-long crystal with a chirping of 9.7 × 10−6 μm−2, and a cw pumping source with a wavelength of 792 nm. The corresponding time correlation width is only 3.5 fs, which implies feasible clock synchronization accuracy in femtosecond scale. We further demonstrate that the narrowing of the time-correlation width slows down dramatically by increasing the chirping and the length of the nonlinear crystal, which provides a theoretical instruction for us to trade off between the complexity of the crystal fabrication and the sufficiently narrow time-correlation width.

Keywords

Nonlinear Crystal Clock Synchronization Phase Match Condition Crystal Length Periodically Pole Lithium Niobate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The work has been supported by the National Natural Science Foundation of China (Grant No.11174282).

References

  1. 1.
    Giovannetti, V., Lloyd, S., & Maccone, L. (2001). Quantum-enhanced positioning and clock synchronization. Nature, 412, 417–419.CrossRefGoogle Scholar
  2. 2.
    Giovannetti, V., Lloyd, S., Maccone, L., & Wong, F. N. C. (2001). Clock synchronization with dispersion cancellation. Physical Review Letters, 87, 117902.CrossRefGoogle Scholar
  3. 3.
    Giovannetti, V., Lloyd, S., & Maccone, L. (2002). Positioning and clock synchronization through entanglement. Physical Review A, 65, 022309.CrossRefGoogle Scholar
  4. 4.
    Zhang, J., Long, G. L., Deng, Z., Liu, W., & Lu, Z. (2004). Nuclear magnetic resonance implementation of a quantum clock synchronization algorithm. Physical Review A, 70, 062322.CrossRefGoogle Scholar
  5. 5.
    Valencia, A., Scarcelli, G., & Shih, Y. (2004). Distant clock synchronization using entangled photon pairs. Applied Physics Letters, 85, 2655–2657.CrossRefGoogle Scholar
  6. 6.
    Tanakal, A., Okamoto, R., Lim, H. H., Subashchandran, S., Okano, M., Kurimura, S. et al. (2011). Collinear ultra-broadband parametric fluorescence generated from 10%-chirped quasi phase matched device, in CLEO/Europe and EQEC 2011 conference digest, OSA Technical digest (CD) (Optical Society of America, 2011), paper EA_P7.Google Scholar
  7. 7.
    Hendrych, M., Shi, X., Valencia, A., & Torres, J. P. (2009). Broadening the bandwidth of entangled photons: a step towards the generation of extremely short biphotons. Physical Review A, 79, 023817.CrossRefGoogle Scholar
  8. 8.
    Kitaeva, G. K., Chekhova, M. V., & Shumilkina, O. A. (2009). Generation of broadband biphotons and their compression in an optical fiber. JETP Letters, 90, 172–176.CrossRefGoogle Scholar
  9. 9.
    Shimizu, R., & Edamatsu, K. (2009). Controlled frequency entanglement of photons in type-II spontaneous parametric down-conversion, in nonlinear optics: Materials, fundamentals and applications, OSA technical digest (CD) (Optical Society of America, 2009), paper JTuB20Google Scholar
  10. 10.
    Nasr, M. B., Carrasco, S., Saleh, B. E. A., Sergienko, A. V., Teich, M. C., Torres, J. P., et al. (2008). Ultrabroadband biphotons generated via chirped quasi- phase-matched optical parametric downconversion. Physical Review Letters, 100, 183601.CrossRefGoogle Scholar
  11. 11.
    O’Donnell, K. A., & U’Ren, A. B. (2007). Observation of ultrabroadband, beamlike parametric downconversion. Optics Letters, 32, 817–819.CrossRefGoogle Scholar
  12. 12.
    Torres, J. P., Macià, F., Carrasco, S., & Torner, L. (2005). Engineering the frequency correlations of entangled two-photon states by achromatic phase matching. Optics Letters, 30, 314–316.CrossRefGoogle Scholar
  13. 13.
    Abolghasem, P., Hendrych, M., Shi, X., Torres, J. P., & Helmy, A. S. (2009). Bandwidth control of paired photons generated in monolithic Bragg reflection waveguides. Optics Letters, 34, 2000–2002.CrossRefGoogle Scholar
  14. 14.
    Giovannetti, V., Maccone, L., Shapiro, J. H., & Wong, F. N. C. (2002). Extended phase-matching conditions for improved entanglement generation. Physical Review A, 66, 043813.CrossRefGoogle Scholar
  15. 15.
    Kuzucu, O., Fiorentino, M., Albota, M. A., Wong, F. N., & Kärtner, F. X. (2005). Two-photon coincident-frequency entanglement via extended phase matching. Physical Review Letters, 94, 083601.CrossRefGoogle Scholar
  16. 16.
    Sang, M. (2003). Quasi-phase matched PPKTP fabrication and relative application research. Doctoral thesis of Tianjin University.Google Scholar
  17. 17.
    Giovannetti, V., Maccone, L., Shapiro, J. H., & Wong, F. N. C. (2002). Generating entangled two-photon states with coincident frequencies. Physical Review Letters, 88, 183602.CrossRefGoogle Scholar
  18. 18.
    Hong, C. K., Ou, Z. Y., & Mandel, L. (1987). Measurement of subpicosecond time intervals between two photons by interference. Physical Review Letters, 59, 2044–2046.CrossRefGoogle Scholar
  19. 19.
    Fradkin, K., Arie, A., Skliar, A., & Rosenman, G. (1999). Tunable midinfrared source by difference frequency generation in bulk periodically poled KTiOPO4. Applied Physics Letters, 74, 914–916.CrossRefGoogle Scholar
  20. 20.
    Fan, T. Y., Huang, C. E., Hu, B. Q., Eckardt, R. C., Fan, Y. X., Byer, R. L., et al. (1987). Second harmonic generation and accurate index of refraction measurements in flux-grown KTiOPO4. Applied Optics, 26, 2390–2394.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Run-ai Quan
    • 1
  • Rui-fang Dong
    • 1
  • Fei-yan Hou
    • 1
  • Yun Bai
    • 1
    • 2
  • Yu Zhang
    • 1
    • 2
  • Tao Liu
    • 1
  • Shou-gang Zhang
    • 1
  1. 1.Key Laboratory of Time and Frequency Primary Standards National Time Service Center, Chinese Academy of ScienceXianChina
  2. 2.Graduate University of Chinese Academy of ScienceBeijingChina

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