Depletion of control field during the propagation of ultraslow optical solitons

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• JOSA B, Vol. 26 Issue 11, pp.2028-2034 (2009)
• Li, Hui-jun; Hang, Chao; Huang, Guoxiang
• We study nonlinear excitations in a lifetime-broadened Λ-type three-level atomic system with a configuration of electromagnetically induced transparency. Different from previous...

Quantum key distribution using polarization and frequency hyperentangled photons

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• JOSA B, Vol. 26 Issue 11, pp.2072-2076 (2009)
• Wang, Chuan; Xiao, Li; Wang, Wan-ying; Zhang, Guang-yu; Long, Gui Lu
• We propose a two-step quantum key distribution protocol using frequency and polarization hyperentangled photons. In this protocol, key information is encoded by unitary operations on...

Photon energy entanglement characterization by electronic transition interference

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• Optics Express, Vol. 17 Issue 23, pp.21280-21288 (2009)
• Hayat, Alex; Ginzburg, Pavel; Orenstein, Meir
• We propose photon energy qubits and schemes for photon energy entanglement characterization. Bell inequality violation for energy qubits and complete Bell state analysis are...

Switching from subluminal to superluminal light propagation via a coherent pump field in a four-level atomic system

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• JOSA B, Vol. 26 Issue 12, pp.2256-2260 (2009)
• Kuang, Shang-qi; Wan, Ren-gang; Kou, Jun; Jiang, Yun; Gao, Jin-yue
• We theoretically investigate the influence of a coherent pump field on the propagation of a weak light pulse of a probe field in a four-level atomic system. Due to the modulation of...

Quantum diffraction of biphotons at a blazed grating

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• JOSA B, Vol. 26 Issue 12, pp.2347-2356 (2009)
• Ostermeyer, Martin; Puhlmann, Dirk; Korn, Dietmar
• Correlations between photons are interesting for a number of applications and concepts in metrology, in particular for resolution improvements in different methods of quantum...