Professor
Chen,Po-Chung

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Personal Website
Office¡G886-3-5742398(PHYS R521)
Fax¡G886-3-5723052
E-mail¡G
pcchen@phys.nthu.edu.tw

Education
  1. 1997-2002 Ph.D in Physics, University of California San Diego, U.S.A.
  2. 1991-1994 B.S. in Physics, National Tsing-Hua University, Taiwan, R.O.C.
Professional Experience
Current position¡G
  1. 2004-present, Assistant Professor of Physics, National Tsing-Hua University
Experience¡G
  1. 2002-2004, Postdoc Fellow. Department of Chemistry, University of California Berkeley, U.S.A.
Honors and Awards
  1. Life Sustainable Award of Year 2007
Research Fields
    1. Quantum Information Science
    2. Coherent Optical Control in Semiconductor Nanostructures
    3. Electronic and Magneto-optical Properties of Semiconductor Nanostructures

Research Interests and achievement
Updated on September 3, 2006

In general I am interested in the ¡§quantum computational physics¡¨, which means the physics related to the implementation of quantum computer and the novel computational methods that are inspired by the quantum information theory. In the past, we have proposed schemes to implement quantum computation using spins and excitons in semiconductor quantum dots as qubits. We have developed theories to optically control spins and excitons in an optimal way to suppress the decoherence. We have also studied the magneto-optical properties and quantum shape effects of CdSe nanostructures.

Recently we have paid some attention to the ¡§dynamical decoupling¡¨ , which is an essential tool to suppress decoherence. We have proposed new method to design bounded decoupling pulses from the geometric perspective. We have also investigated the efficiency of realistic decoupling pulses acting on a system coupled to a general environment via studying the renormalization of the non-Markovian dynamics.

On the other hand, the link between quantum information theory and ¡§Density Matrix Renormalization Group¡¨ (DMRG) has begun to be exploited recently. ¡§Time-Dependent DRMG¡¨ at zero and finite temperature based on DMRG have been developed. We are currently building our own static and TD-DMRG code. As a first application we are investigating the decoherence of a central spin coupled to an interaction spin chain. Other possible applications include calculating the transport properties of a strongly correlated system and using TD-DMRG as the impurity solver of the ¡§Dynamical Mean Field Theory¡¨ (DMFT).

Selected Publications
  1. [2006] Pochung Chen, Dynamical decoupling induced renormalization of the non-Markovian dynamics, quant-ph/0609222, (2006). Submitted to Phys. Rev. A.
  2. [2006] Pochung Chen, Geometric continuous dynamical decoupling with bounded controls, Phys. Rev. A 73, 022343 (2006).
  3. [2005] Pochung Chen, Quantum shape effects on Zeeman splittings in semiconductor nanostructures, Phys. Rev. B 72, 045335 (2005).
  4. [2004] Pochung Chen and K. Birgitta Whaley, Magneto-optical response of CdSe nanostructures, Phys. Rev. B 70, 045311 (2004).
  5. [2004] Pochung Chen, C. Piermarocchi, L. J. Sham, D. Gammon, and D. G. Steel, Theory of quantum optical control of a single spin in a quantum dot, Phys. Rev. B 69, 075320 (2004).
  6. [2004] J. Fernandez-Rossier, C. Piermarocchi, Pochung Chen, A. H. MacDonald, and L. J. Sham, Coherently photoinduced ferromagnetism in diluted magnetic semiconductors, Phys. Rev. Lett. 93, 127201 (2004).
  7. [2002] C. Piermarocchi, Pochung Chen, L. J. Sham, and D. G. Steel, Optical RKKY Interaction between Charged Semiconductor Quantum Dots, Phys. Rev. Lett. 89, 167402 (2002).
  8. [2002] C. Piermarocchi, Pochung Chen, Y. S. Dale, and L. J. Sham, Theory of fast quantum control of exciton dynamics in semiconductor quantum dots, Phys. Rev. B 65, 075307 (2002).

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