Quantum computer networks with the orbital angular momentum of light

Inside computer networks, different information processing tasks are necessary to deliver the user data efficiently. This processing can also be done in the quantum domain. We present simple optical quantum networks where the orbital angular momentum of a single photon is used as an ancillary degree of freedom which controls decisions at the network level. Linear optical elements are enough to provide important network primitives like multiplexing and routing. First we show how to build a simple multiplexer and demultiplexer which combine photonic qubits and separate them again at the receiver. We also give two different self-routing networks where the OAM of an input photon is enough to make it find its desired destination.

[1]  Pedro Chamorro-Posada,et al.  Delayed commutation in quantum computer networks. , 2006, Physical review letters.

[2]  G. Molina-Terriza,et al.  How a Dove prism transforms the orbital angular momentum of a light beam. , 2006, Optics express.

[3]  M Ritsch-Marte,et al.  Violation of a Bell inequality in two-dimensional orbital angular momentum state-spaces. , 2009, Optics express.

[4]  Pedro Chamorro-Posada,et al.  Quantum multiplexing with the orbital angular momentum of light , 2008, 0901.4740.

[5]  A. Zeilinger,et al.  Long-distance quantum communication with entangled photons using satellites , 2003, quant-ph/0305105.

[6]  William Stallings,et al.  Data and Computer Communications , 1985 .

[7]  N. Gisin,et al.  Pulsed Energy-Time Entangled Twin-Photon Source for Quantum Communication , 1999 .

[8]  N. Gisin,et al.  Long-term performance of the SwissQuantum quantum key distribution network in a field environment , 2011, 1203.4940.

[9]  Kishan Dholakia,et al.  The Production Of Multiringed Laguerre-Gaussian Modes By Computer-Generated Holograms , 1998 .

[10]  Wolfgang Dür,et al.  Quantum Repeaters: The Role of Imperfect Local Operations in Quantum Communication , 1998 .

[11]  S. Barnett,et al.  Measuring the orbital angular momentum of a single photon. , 2002, Physical review letters.

[12]  S. Barnett,et al.  Free-space information transfer using light beams carrying orbital angular momentum. , 2004, Optics express.

[13]  Reck,et al.  Experimental realization of any discrete unitary operator. , 1994, Physical review letters.

[14]  J. Mora,et al.  Experimental demonstration of Subcarrier Multiplexed Quantum Key Distribution system feasibility , 2011, 2011 13th International Conference on Transparent Optical Networks.

[15]  Stephen M. Barnett,et al.  Optical Angular Momentum , 2003 .

[16]  Nicolas Godbout,et al.  Multiuser quantum key distribution using wavelength division multiplexing , 2003, Other Conferences.

[17]  Paul D. Townsend,et al.  Quantum information to the home , 2011, 2011 37th European Conference and Exhibition on Optical Communication.

[18]  J. Cirac,et al.  Quantum State Transfer and Entanglement Distribution among Distant Nodes in a Quantum Network , 1996, quant-ph/9611017.

[19]  Sartaj Sahni,et al.  A Self-Routing Benes Network and Parallel Permutation Algorithms , 1981, IEEE Transactions on Computers.

[20]  Shih,et al.  New type of Einstein-Podolsky-Rosen-Bohm experiment using pairs of light quanta produced by optical parametric down conversion. , 1988, Physical review letters.

[21]  Pedro Chamorro-Posada,et al.  Quantum multiplexing with optical coherent states , 2009, Quantum Inf. Comput..

[22]  José Capmany,et al.  Subcarrier multiplexing optical quantum key distribution , 2006 .

[23]  M. Padgett,et al.  The generation of free-space Laguerre-Gaussian modes at millimetre-wave frequencies by use of a spiral phaseplate , 1996 .

[24]  Wolfgang Mathis,et al.  Scheme for optical implementation of orbital angular momentum beam splitter of a light beam and its application in quantum information processing , 2005 .

[25]  J. Rarity,et al.  Ground to satellite secure key exchange using quantum cryptography , 2002 .

[26]  Thomas Jennewein,et al.  How to create and detect N-dimensional entangled photons with an active phase hologram , 2007, 0707.0061.