Unclassified Nsn 7540 - 01 - 280 - 5500

We have realized the first demonstration of “relativistic” quantum cryptography, using both faint laser pulses and entangled photons. By incorporating an optical delay cavity, Bob is able to measure every photon from Alice in the correct basis, leading to enhanced key rates, as well as some security advantages. We have also implemented our proposal for a high-speed quantum random number generator, in which the arrival time of a detected photon is used to generate ~8 random bits per photon. Our system produced cryptographically secure bits at over 4 Mbits/s, with a clear path toward even higher rates. In addition, we solved a number of technical problems to produce 99%-fidelity polarization-entangled pairs from a diode-laser pumped source. Extending our previous implementation of remote state preparation, we have incorporated hyperentanglement to successfully remotely prepare entangled states. Finally, we studied the use of hyperentangled photons as a resource for improved quantum dense coding. Although our experimental verification is still in progress, we identified the theoretically optimal configuration, and compared hyperentangled and multi-pair encoding. (a) Papers published in peer-reviewed journals (N/A for none) 1. “Generation of hyper-entangled photon pairs”, J. T. Barreiro, N. K. Langford, N. A. Peters, and P. G. Kwiat, Phys. Rev. Lett. 95, 260501 (2005). 2. “Phase-compensated ultra-bright source of entangled photons”, J. B. Altepeter, E. R. Jeffrey, and P. G. Kwiat, Opt. Expr. 13, 8951 (2005). 3. “Optical Implementation of Quantum Orienteering”, E. R. Jeffrey, J. B. Altepeter, M. Colci, and P. G. Kwiat, Phys. Rev. Lett. 96, 150503. (2006). List of papers submitted or published that acknowledge ARO support during this reporting period. List the papers, including journal references, in the following categories: (b) Papers published in non-peer-reviewed journals or in conference proceedings (N/A for none) 3.00 Number of Papers published in peer-reviewed journals: Number of Papers published in non peer-reviewed journals: 1. “Quantum Orienteering”, P. G. Kwiat, E. R. Jeffrey, and J. B. Altepeter, SPIE 2005, San Diego, CA, Aug. 1 – 4, 2005. 2. “The Entanglement Revolution”, P. G. Kwiat, Entry in Amazing Light: Young Scholars Competition, as part of Visions for Discovery symposium in honor of Charles Townes’ 90th Birthday, U.C., Berkeley, Oct. 5-7, 2005. 3. “Hyperentanglement: When One Degree of Freedom Isn’t Enough”, 36th Winter Colloquium on the Physics of Quantum Electronics, Snowbird, Utah, Jan. 2-6, 2006. 4. “The Quantum Information Revolution: Einstein's Legacy”, Valparaiso University Physics Dept. colloquium, Feb. 24, 2006. 5. “Relativistic Quantum Cryptography”, Evan Jeffrey and Paul Kwiat, APS March Meeting, Mar. 13-17, Baltimore, MD (2006) 6. “Optical resources for quantum information processing", Workshop on Linear Optical Quantum Information Processing (LoQUIP), Lousiana State University, Baton Rouge, Louisiana, April 10-12, 2006. 7. “Hyperentanglement: Generation and Applications”, Julio Barreiro, Nicholas Peters, Nathan Langford and Paul Kwiat, CLEO/QELS 2006, May 21-26, Longbeach, CA (2006) 8. “The Quantum Information Revolution: 101 Uses for a Schroedinger Cat”, Distinguished Lecture, Oak Ridge National Laboratory, July 11, 2006. 9. “Relativistic Quantum Cryptography”, Paul Kwiat, Conference on Quantum Information and Quantum Control II, Univ. of Toronto, Canada, Aug. 8-11, 2006. 10. “Hyperentanglement for Quantum Communication: Remote Preparation of Single-photon Entangled States”, Julio T. Barreiro, Nicholas A. Peters and Paul G. Kwiat, International Conference on Quantum Foundation and Technology: Frontier and Future (ICQFT06), Zhejiang University, Hangzhou, China (Aug. 26-29, 2006) 11. “Relativistic Quantum Cryptography”, Evan Jeffrey and Paul Kwiat, APS March Meeting, Baltimore, MD (Mar. 13-17, 2006) (c) Presentations 0.00 Number of Presentations: 11.00 Non Peer-Reviewed Conference Proceeding publications (other than abstracts): “Remote State Preparation: Arbitrary remote control of photon polarizations for quantum communication”, N. A. Peters, J. T. Barreiro, M. E. Goggin, T.-C. Wei, and P. G. Kwiat, Proc. SPIE, Quantum Communications and Quantum Imaging Conference III (Aug. 2-6, 2005), Ronald Meyers, ed. Number of Non Peer-Reviewed Conference Proceeding publications (other than abstracts): 1 Peer-Reviewed Conference Proceeding publications (other than abstracts): "Relativistic Quantum Cryptography", Evan Jeffrey, Joseph Altepeter, and Paul Kwiat, in preparation "High-speed Quantum Random Number Generation", Evan Jeffrey, Gleb Akselrod, Joseph Altepeter, and Paul Kwiat, in preparation "Remote Entangled-State Preparation", Julio Barreiro and Paul Kwiat, in preparation (d) Manuscripts Number of Peer-Reviewed Conference Proceeding publications (other than abstracts): 0 Number of Manuscripts: 3.00 Number of Inventions: