Department of Physics 366 LeConte Hall University of California Berkeley, CA 94720-7300 | ||

Phone | 510-642-5046 (office) | |

Office | 419 Hearst Memorial Mining Building | |

UC Berkeley, Ph.D. Physics |
DOE Office of Science Graduate Fellow | 2008-Present |

Swarthmore College, B.A. Physics |
High Honors, Phi Beta Kappa | 2004-2008 |

I work with Birgitta Whaley in the Berkeley Quantum Information & Computation Center. My Ph.D. research is on the role of electronic quantum coherence in photosynthetic energy transfer. Here are a few of the overarching questions I aim to answer:

- What can coherence tell us about photosynthesis?
- Does quantum coherence contribute to biological function?
- Is photosynthesis accessible to tools and concepts from quantum information theory?

- S. H., Filippo Caruso, Simone Montangero, Mohan Sarovar, Tommaso Calarco, Martin B. Plenio, K. Birgitta Whaley,
**Realistic and verifiable coherent control of excitonic states in a light harvesting complex**, arXiv:1307.4807 - S. H. and K. Birgitta Whaley,
**Inverting pump-probe spectroscopy for state tomography of excitonic systems**, J. Chem. Phys.**138**, 164102 (2013), arXiv:1209.6625. Mathematica source for dimer model in Sec. IV(A). - S. H., Akihito Ishizaki and K. Birgitta Whaley,
**Spatial propagation of excitonic coherence enables ratcheted energy transfer**, Phys. Rev. E**86**, 041911 (2012), arXiv:1106.2911 - S. H., Mohan Sarovar and K. Birgitta Whaley,
**Limits of quantum speedup in photosynthetic light harvesting**, New J. Phys.**12**, 065041 (2010), arXiv:0910.1847 - S. H. and David A. Meyer,
**Faster transport with a directed quantum walk**. Phys. Rev. A**79**, 024307 (2009), arXiv:0901.1007. Selected for publication in the Virtual Journal of Quantum Information. Mathematica source for Fig. 2.

See my Google Scholar profile.

**Limits of quantum speedup in photosynthesis**. APS March Meeting 2010, Portland, Oregon, USA (March 2010).**Quantum random walks in energy landscapes**. Workshop on Quantum Effects in Biological Systems (QuEBS 2009), Lisbon, Portugal (July 2009).

At Swarthmore College, I majored in physics and minored in mathematics. Here are my final projects for each department:

- Undergraduate thesis: Quantum random walk search on satisfiability problems
- Math senior conference paper: Classification of completely positive maps

Top-down view of the Fenna-Matthews-Olson (FMO) light harvesting complex of green sulfur bacteria, showing chlorophyll molecules (green) surrounded by the protein backbone (gray).

In a recent paper, we showed that quantum coherent motion can enable biased energy transfer in light-harvesting systems via a ratchet effect. This effect may contribute to the efficiency of natural light harvesting systems such as FMO.