Bulletin of the American Physical Society
42nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 56, Number 5
Monday–Friday, June 13–17, 2011; Atlanta, Georgia
Session K6: Advances in Quantum Communication |
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Chair: Mark Saffman, University of Wisconsin--Madison Room: A706 |
Wednesday, June 15, 2011 2:00PM - 2:30PM |
K6.00001: Satellite-based quantum communications Invited Speaker: Single-photon quantum communications offers the attractive feature of ``future proof'' security rooted in the laws of quantum physics for the transfer of cryptographic keys. Secure distribution of keys is necessary for the encryption and authentication of conventional communications. Ground-based quantum communications experiments in optical fiber have attained transmission ranges in excess of 200km, but for larger distances to become feasible we proposed a methodology that would make satellite-to-ground quantum communications possible. Satellite feasibility studies have been published by research groups in the US, Europe, Japan and China, and collaborations in several countries have published conceptual experimental plans. In this talk we will review the main features required for low-earth orbit satellite-toground quantum communications, and describe the results of ground-based quantum communications experiments across atmospheric paths conducted by our team over the past decade. Using these results as an anchor, we will describe a link model, incorporating photon transmission, loss and background physical processes, for estimating satellite-to-ground quantum communications performance. We will show results from this model for the projected performance of a hypothetical quantum communications terminal on the International Space Station, with a hypothetical ground terminal in Los Alamos, NM. [Preview Abstract] |
Wednesday, June 15, 2011 2:30PM - 3:00PM |
K6.00002: Recent Progress in Quantum Teleportation Experiments Invited Speaker: Quantum teleportation is central to quantum communication, and plays an important role in a number of quantum computation protocols. Significant experimental progresses have been achieved since the seminal proposal by Bennett et al. in 1993. The very first experimental demonstrations were given by Innsbruck and Rome group with photonic realizations. Besides, teleportation has also been demonstrated by use of coherent light fields, with a complete Bell state measurement through nonlinear photonic interactions, trapped ions, between distant matter qubits etc. After the first Innsbruck experiment, we have managed to teleporting freely flying qubits without the need to detect the teleported photon. With five-photon and six-photon entanglement, an open-destination teleportation and a two-qubit composite system teleportation were implemented in 2004 and 2006. The combination of quantum teleportation and quantum memory of photonic qubits is essential for large-scale quantum communication and quantum computation. We have further achieved teleportation between photonic and atomic qubits in 2008. Since teleportation has only been realized in fiber with a level of hundreds meters, optical free-space link is highly desirable for extending the transfer distance. We have made a free-space quantum teleportation over 16 km which confirms the feasibility of space-based experiments. [Preview Abstract] |
Wednesday, June 15, 2011 3:00PM - 3:30PM |
K6.00003: Quantum memories for telecom networks Invited Speaker: Quantum mechanics provides a mechanism for absolutely secure communication between remote parties for distances greater than 100 kilometers direct quantum communication via optical fiber is not viable, due to fiber losses, and intermediate storage of quantum information along the transmission channel is necessary, leading to the concept of the quantum repeater. I will outline our program on the use of long-lived atomic memories as an interface for telecom quantum networks. Work done in collaboration with A. Radnaev, Y. Dudin, R. Zhao, J. Blumoff, H. H. Jen, S. Jenkins, and B. Kennedy. [Preview Abstract] |
Wednesday, June 15, 2011 3:30PM - 4:00PM |
K6.00004: Linear-optics implementations of nondestructive single-photon measurements and arbitrary quantum channels Invited Speaker: We consider implementations of quantum information processing with linear optics. The first result regards the realization of an arbitrary quantum channel on a single-photon multimode qudit. [1] We prove that any such channel can be realized perfectly albeit only stochastically under a set of assumptions that make our scheme amenable to experimental realization. We discuss in detail the optimal probability of success of the scheme, that turns out to be connected to the entanglement properties of the Choi- Jamiolkowski state isomorphic to the channel to be realized. The second result [2] is an improvement of a simple circuit proposed by Nicholas et al. [3] that heralds the presence of single photons without disturbing the information encoded in polarization. This scheme again only works stochastically but its success probability can be made arbitrarily high by increasing the complexity of the ancilla state used. We consider the application of this circuit to counteract transmission loss in device independent quantum key distribution.\newline For both cases we briefly discuss the possible challenges of an actual implementation. \\[4pt] [1] M. Piani, D. Pitkanen, R. Kaltenbaek, N. L\"utkenhaus, arXiv:1012.3473. \newline [2] D. Pitkanen, X.F. Ma, R. Wickert, P. Van Loock, N. L\"utkenhaus, in preparation.\newline [3] G. Nicholas, S. Pironio, N. Sangouard, Phys. Rev. Lett. {\bf 105}, 07051 (2010). [Preview Abstract] |
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