# Charles Santori

Intelligent Infrastructure Lab

Palo Alto

## Biography

Charles received his S.B. degree in Physics from MIT in 1997 and his Ph.D. in Applied Physics from Stanford in 2003. His dissertation research was in the group of Prof. Y. Yamamoto, where he studied semiconductor quantum dots as sources of single photons and correlated photon pairs.

He joined HP Labs in 2005, where he is currently researching nanoscale classical and quantum optics. His current interests include electromagnetically induced transparency in solids, and optical manipulation of single spins in solids for quantum information and sensing applications.

## Research interests

Recently, a particular color center in diamond, the nitrogen-vacancy (NV) center, has received much attention as a promising solid-state spin system for potential quantum information and sensing applications. The NV center combines long (ms) electron spin coherence at room temperature with optical initialization and readout capabilities. At HP, our research addresses some of the remaining problems that must be solved before applications can be realized:

1) Coupling of NV centers to microcavities and waveguides, as needed for efficient photon collection and to enable many NV centers to be connected together through an optical network;

2) Finding new methods for optical manipulation of electronic and nuclear spins;

3) Finding realiable methods to create NV centers with good spectral properties at a desired location.

## Publications

Selected Publications at HP:

1. K.-M. C. Fu, C. Santori, P. E. Barclay, I. Aharonovich, S. Prawer, N. Meyer, A. M. Holm, and R. G. Beausoleil, "Coupling of nitrogen-vacancy centers in diamond to a GaP waveguide," Appl. Phys. Lett. 93, 234107 (2008).

2. T. P. Mayer Alegre, C. Santori, G. Medeiros-Ribeiro, and R. G. Beausoleil, "Polarization-selective excitation of nitrogen vacancy centers in diamond," Phys. Rev. B 76, 165205 (2007).

3. C. Santori, P. Tamarat, P. Neumann, J. Wrachtrup, D. Fattal, R. Beausoleil, J. Rabeau, P. Olivero, A. Greentree, S. Prawer, F. Jelezko, and P. Hemmer, "Coherent population trapping with a single spin in diamond," Phys. Rev. Lett. 97, 247401 (2006).

4. C. Santori, D. Fattal, S. M. Spillane, M. Fiorentino, R. G. Beausoleil, A. D. Greentree, P. Olivero, M. Draganski, J. R. Rabeau, P. Reichart, B. C. Gibson, S. Rubanov, D. N. Jamieson, and S. Prawer, "Coherent Population Trapping in Diamond N-V Centers at Zero Magnetic Field," Optics Express 14, 7986 (2006).

Before HP:

1. C. Santori, S. Gotzinger, Y. Yamamoto, S. Kako, K. Hoshino, and Y. Arakawa, "Photon correlation studies of single GaN quantum dots", Appl. Phys. Lett. 87, 051916 (2005).

2. K.-M. Fu, C. Santori, C. Stanley, M. C. Holland, and Y. Yamamoto, "Coherent population trapping of electron spins in a high-purity n-type GaAs semiconductor," Phys. Rev. Lett. 95, 187405 (2005).

3. E. Waks, K. Inoue, C. Santori, D. Fattal, J. Vuckovic, G. S. Solomon, and Y. Yamamoto, "Secure Communication: Quantum cryptography with a photon turnstile," Nature 420, 762 (2002).

4. C. Santori, D. Fattal, J. Vuckovic, G.S. Solomon, and Y. Yamamoto, "Indistinguishable photons from a single-photon device", Nature 419, 594 (2002).

5. C. Santori, D. Fattal, M. Pelton, G.S. Solomon, and Y. Yamamoto, "Polarization-correlated photon pairs from a single quantum dot," Phys. Rev. B 66, 045308 (2002).

6. C. Santori, M. Pelton, G. Solomon, Y. Dale, and Y. Yamamoto, "Triggered single photons from a quantum dot," Phys. Rev. Lett. 86, 1502 (2001).