Efficient photon sorter in a high-dimensional Hilbert space

Details Efficient photon sorter in a high-dimensional Hilbert space Efficient photon sorter in a high-dimensional Hilbert space

2008-10-02

arxiv.org/abs/0810.0336v3

Quantum Information and Computation, Vol. 11, No. 3&4 (2011) 0313-0325

Physics

Quantum Physics

10 pages (revtex4), 3 figures (eps), 1 table; Substantial revision, new sections, new figures. published

Scientific paper

An increase in the dimension of state space for quantum key distribution (QKD) can decrease its fidelity requirements while also increasing its bandwidth. A significant obstacle for QKD with qudits (d>2) has been an efficient and practical quantum state sorter for photons whose complex fields are modulated in both amplitude and phase. We propose such a sorter based on a multiplexed thick hologram, constructed e.g. from photo-thermal refractive (PTR) glass. We validate this approach using coupled-mode theory with parameters consistent with PTR glass to simulate a holographic sorter. The model assumes a three-dimensional state space spanned by three tilted planewaves. The utility of such a sorter for broader quantum information processing applications can be substantial.

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