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RESEARCH INTERESTS
The primary focus is generation of non-classical states of radiation fields and their applications in precision measurements, quantum computing, and communication. Current interests include design of efficient single-photon sources and detectors, multi-photon entanglement, enhancement of nonlinear optical processes using atomic coherence, single-photon quantum nondemolition measurements, and thermal emission properties of photonic crystals.
Quantum Computing and Metrology:
A new concept of quantum computation has been developed in recent years. The basic unit of a quantum computer is a quantum mechanical two-level system (qubit) that can be in coherent superpositions of the logical values 0 and 1, as opposed to classical bits that represent either the values 0 or 1. The implementation of computations is carried out by unitary transformations, which consist of the individual quantum logic gates. The utilization of superposition and entanglement leads to a high degree of parallelism, which makes the speed of certain types of computation exponentially faster than the classical counterpart. In optical approach to quantum computation, qubits are usually represented by the state of polarization of a single photon. The main difficulty lies in the fact that the necessary two-qubit logic gates need a nonlinear interaction between the two photons and the efficiency of this nonlinear interaction is typically very tiny at the single-photon level. This obstacle, however, can be avoided by making corrections to the output of the logic devices based on the results of single-photon detectors. Such a technique can be applied for producing quantum correlations as an important resource for Heisenberg-limited optical interferometry, where the sensitivity of phase measurements can be improved beyond the shot-noise limit.
Thermal Emission Modification by Photonic Crystals:
Photonic band-gap technology is a revolution in photonics in that precise control of all electromagnetic wave properties becomes possible. In particular, the emission profile of thermal radiation is modified by the available radiation modes in photonic crystals and it is possible to have the emission only into a narrow frequency band near the band edge. This observation leads to an interesting possibility for efficient energy conversion in thermophotovoltaic systems. For example, in thermophotovoltaic solar energy conversion, there is an intermediate absorber between the sun and the photovoltaic cell. The intermediate absorber is heated by absorbing solar radiation and the re-emitted radiation is absorbed by the solar cell and converted to electrical energy. Photonic crystals can be used as the intermediate absorber to funnel the thermal radiation into a desired frequency band for efficient solar energy conversion.
CURRENT AND SELECTED PUBLICATIONS
- Federico M. Spedalieri, Hwang Lee, and Jonthan P. Dowling, "High-fidelity linear optical quantum computing with polarization encoding," Phys. Rev. A 73, 012334 (2006).
- Marian Florescu, Hwang Lee, Andrew J. Stimpson, and Jonathan P. Dowling, "Thermal emission and absorption of radiation in finite inverted-opal photonic crystals," Phys. Rev. A 72, 033821 (2005).
- H. Lee, P. Kok, C.P. Williams, and J.P. Dowling, "From Linear Optical Quantum Computing to Heisenberg-Limited Interferometry," J. Opt. B: Quantum and Semiclassical Optics 6, S796 (2004).
- R.M. Gingrich, P. Kok, H. Lee, F. Vatan, and J.P. Dowling, "All Linear Optical Quantum Memory Based on Quantum Error Correction," Phys. Rev. Lett. 91, 217901 (2003).
- H. Lee, Y. Rostovstev, C.J. Gednar, and A. Javan, "From Laser Induced Line Narrowing to Electromagnetically Induced Transparency: Close System Analysis," Appl. Phys. B: Lasers and Optics 76, 33 (2003).
- H. Lee, P. Kok, and J.P. Dowling, "A Quantum Rosetta Stone for Interferometry," J. Mod. Opt. 49, 2325 (2002).
- A. Javan, O. Kocharovskaya, H. Lee, and M.O. Scully, "Narrowing of Electromagnetically Induced Transparency Resonance in a Doppler Broadened Medium," Phys. Rev. A 66, 0713805 (2002).
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