Research Interests

The foundation of modern physics has provided a challenge to our perception since the introduction of quantum theory. The development of technology has moved us closer to limits set by nature rather than by our skills. This means that understanding the foundation of quantum theory is becoming more important. At UMBC recent theoretical and experimental research is aimed at understanding the non-local behavior of light through a series of studies. We are studying the nonlocal interference properties of the two-photon state produced by optical parametric down conversion. This work has illustrated behavior that cannot be reproduced by classical electromagnetic fields and has clarified the nature of the entangled two-photon state produced by parametric down conversion. Some interesting practical applications of our research have been to metrology and quantum imaging. Expanding on this work, we are looking at more efficient sources of two-photon states using four-wave mixing and slow light. In addition, we have recently begun a study of three photon imagining based on our earlier work using down conversion and up conversion to generate three photon entangled states.

The paper of Einstein, Podolsky, and Rosen led Schrodinger to introduce the term entanglement for a superposition of states of subsystems that may be far apart. Entanglement is one of the most fascinating and puzzling aspects of quantum physics. The general characterization of entanglement is a difficult mathematical problem. We have been carrying out theoretical analyses to study this problem.

Selected and Recent Publications

Jianming Wen, P. Xu, Morton H. Rubin, Yanhua Shih, Transverse correlations in triphoton entanglement: Geometrical and physical optics, accepted for publication Phys. Rev. A

Jianming Wen, Shengwang Du , and Morton H. Rubin, Spontaneous parametric down-conversion in a three-level system, Phys. Rev. A 76 (2007).

Shengwang Du, Eun Oh, Jianming Wen, and Morton H. Rubin, Four-wave mixing in three-level systems: Interference and entanglement  Phys. Rev. A 76, 013803 (2007).

Shengwang Du, Jianming Wen, Morton H. Rubin, and G. Y. Yin, Four-Wave Mixing and Biphoton Generation in a Two-Level System, Phys. Rev. Lett. 98, 053601 (2007).

Jianming Wen, Shengwang Du, and Morton H. Rubin, Biphoto generation in a two-level atomic ensemble , Phys. Rev. A 75, 033809 (2007).

Jianming Wen and Morton H.Rubin, Transverse Effects in Paired Photon Generation via an EIT Medium II: Beyond Perturbation Theory, Phys. Rev. A 74, 023809 (2006).

Milena D’Angelo, Alejandra Vlencia, Morton H. Rubin, and Yanhua Shih, Resolution of quantum and classical ghost imaging, Phys. Rev. A 72, 13810 (2005).

Sulakshana Thanvanthri, Jianming Wen, and Morton H. Rubin, Effects of mismatched transmissions on two-mode squeezing and EPR correlations with a slow light medium, Phys. Rev. A 72, 023822 (2005)

Jianming Wen and Morton H. Rubin, Theory of Two-photon Interference in an Electromagnetically Induced Transparency System, Phys. Rev. A 70, 063806 (2004).

Sulakshana. Thanvanthri and Morton H. Rubin, Ghost Interference with Optical Parametric Amplifier, Phys. Rev. A 70, 063811 (2004).

Arthur O. Pittenger and Morton H. Rubin, Mutually unbiased bases, generalized spin matrices and separability, Lin. Alg. and its Appl., 390, 255 (2004).

Arthur O. Pittenger and Morton H. Rubin, The geometry of entanglement witnesses and local detection of entanglement, Phys. Rev. A 67, 012327 (2003).

A. O. Pittenger and M. H. Rubin, Convexity and the separability problem in quantum mechanical density matrices, Linear Algebra and its Applications 346, 47 (2002).

Y.-H. Kim, M. V. Chekhova, S. P. Kulik, M. H. Rubin, and Y. Shih, Interferometric Bell State Preparation Using Femtosecond Pulse Pumped Spontaneous Down-Conversion, Phys. Rev. A 63, 062301 (2001).

A. O. Pittenger and M. H. Rubin, Note on Separability of the Werner states in arbitrary dimensions, Optics Communications 179, 447 (2000).

A. O. Pittenger and M. H. Rubin, Complete separability and Fourier representations of n-qubit states, Phys. Rev. A62, 042306 (2000).

M. H. Rubin, Entanglement and State Preparation, Phys. Rev. A61, 022311-1 (2000).

T. E. Keller, M. H. Rubin, Y. Shih, Two-photon Entanglement From Spontaneous Parametric Down Conversion From Temporally Distinct Pulses, Phys. Lett. A 244, 507 (1998).

M. H. Rubin, Transverse Correlations in optical spontaneous parametric down-conversion, Phys. Rev. A54, 5349 (1996).

T. B. Pittman, D. V. Strekalov, A. Migdall, M. H. Rubin, A. V Sergienko and Y. H. Shih, Can two-photon interference be considered the interference of two photons?, Phys. Rev. Lett, 77, 1917 (1996).

M. H. Rubin, Y. H. Shih, and A. V. Sergienko, Einstein-Podolsky-Rosen State for Space-Time Variables in a Two Photon Interference Experiment, Phys. Rev. A47, 1288 (1993).