- Mar 22, 2009
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Simply amazing.Quantum entanglement between an optical photon and a solid-state spin qubit
E. Togan1,8, Y. Chu1,8, A. S. Trifonov1, L. Jiang1,2,3, J. Maze1, L. Childress1,4, M. V. G. Dutt1,5, A. S. Sørensen6, P. R. Hemmer7, A. S. Zibrov1 & M. D. Lukin1
Correspondence to: M. D. Lukin1 Email: email@example.com
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
- Department of Physics, California Institute of Technology, Pasadena, California 91125, USA
- Institute for Quantum Information, California Institute of Technology, Pasadena, California 91125, USA
- Department of Physics and Astronomy, Bates College, Lewiston, Maine 04240, USA
- Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
- QUANTOP, The Niels Bohr Institute, University of Copenhagen, DK2100 Copenhagen, Denmark
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843, USA
- These authors contributed equally to this work.
Journal name:NatureVolume:466,Pages:730–734Date published05 August 2010)DOI:doi:10.1038/nature09256 Received08 February 2010Accepted08 June 2010Quantum entanglement is among the most fascinating aspects of quantum theory1. Entangled optical photons are now widely used for fundamental tests of quantum mechanics2 and applications such as quantum cryptography1. Several recent experiments demonstrated entanglement of optical photons with trapped ions3, atoms4, 5 and atomic ensembles6, 7, 8, which are then used to connect remote long-term memory nodes in distributed quantum networks9, 10, 11. Here we realize quantum entanglement between the polarization of a single optical photon and a solid-state qubit associated with the single electronic spin of a nitrogen vacancy centre in diamond. Our experimental entanglement verification uses the quantum eraser technique5, 12, and demonstrates that a high degree of control over interactions between a solid-state qubit and the quantum light field can be achieved. The reported entanglement source can be used in studies of fundamental quantum phenomena and provides a key building block for the solid-state realization of quantum optical networks13, 14.
Quantum entanglement between an optical photon and a solid-state spin qubit : Nature : Nature Publishing Group
What quantum entanglement is, is basically the proven concept that the change in the state of one object can have an effect on another object without any known direct energy transfer between the two objects whatsoever, (at least at the quantum level). Because particles must obey the laws of conservation for example two particles are created in a two state spin where one particle must spin up and one must spin down. What is really interesting is that distance between the two oarticles does not matter, they could be at completely opposite ends of the universe and let's say you were able to change the spin of a given particle A which was entangled with a twin particle B at the other end of the universe particle B would simultaneously change spin as well. This dislocated changing of state has been observed in the lab starting in the early 80's and in 2008 it was determined through the use of lasers that this entanglement has a minimum lower bound of 10,000 times the speed of light. But these experiments only involve uncontrollable observations not the changing of state themselves thus information can not be transferred using this method at this time, but if we found a way to change the state of particle A which was entangled with particle B then faster than light speed communication could be possible. This is, also, indirect evidence for multiple dimensions because what ever it is causing this interaction must be occurring outside of known space time.
Of interesting note, this is a clear violation of the Copenhagen interpretation which says that the state of a given particle is only determined when that particle is measured (Shrodinger's Cat) but with entangled particles we know the state of particle B whether we measure it or not.