Methods for Producing Decoherence-Free States and Noiseless Subsystems Using Photonic Qutrits

Details Methods for Producing Decoherence-Free States and Noiseless Subsystems Using Photonic Qutrits Methods for Producing Decoherence-Free States and Noiseless Subsystems Using Photonic Qutrits

2007-09-02

arxiv.org/abs/0709.0021v2

Physical Review A 77, 012314 (2008)

Physics

Quantum Physics

12 pages, 9 (color) figures, misc minor changes from referee suggestions and an added reference

Scientific paper

10.1103/PhysRevA.77.012314

We outline a proposal for a method of preparing an encoded two-state system (logical qubit) that is immune to collective noise acting on the Hilbert space of the states supporting it. The logical qubit is comprised of three photonic three-state systems (qutrits) and is generated by the process of spontaneous parametric down conversion. The states are constructed using linear optical elements along with three down-conversion sources, and are deemed successful by the simultaneous detection of six events. We also show how to select a maximally entangled state of two qutrits by similar methods. For this maximally entangled state we describe conditions for the state to be decoherence-free which do not correspond to collective errors.

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