Constructing Four-Photon States for Quantum Communication and Information Processing |
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Authors: | Gregg Jaeger Alexander Sergienko |
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Affiliation: | (1) Quantum Imaging Laboratory and College of General Studies, Boston University, Boston, MA 02215, USA;(2) Quantum Imaging Laboratory, Department of Electrical and Computer Engineering, and Department of Physics, Boston University, Boston, MA 02215, USA |
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Abstract: | We provide a method for constructing a set of four-photon states suitable for quantum communication applications. Among these states is a set of concatenated quantum code states that span a decoherence-free subspace that is robust under collective-local as well as global dephasing noise. This method requires only the use of spontaneous parametric down-conversion, quantum state post-selection, and linear optics. In particular, we show how this method can be used to produce all sixteen elements of the second-order Bell gem , which includes these codes states and is an orthonormal basis for the Hilbert space of four qubits composed entirely of states that are fully entangled under the four-tangle measure. |
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Keywords: | Quantum computing Quantum coding Entangled photons Bell states |
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