Towards Linear Optical Quantum Computers

Details Towards Linear Optical Quantum Computers Towards Linear Optical Quantum Computers

2004-02-13

arxiv.org/abs/quant-ph/0402090v1

Physics

Quantum Physics

9 pages; Submitted to a special issue of Quantum Information Processing on "The Physics of Quantum Computing"

Scientific paper

Scalable quantum computation with linear optics was considered to be impossible due to the lack of efficient two-qubit logic gates, despite its ease of implementation of one-qubit gates. Two-qubit gates necessarily need a nonlinear interaction between the two photons, and the efficiency of this nonlinear interaction is typically very tiny in bulk materials. However, we recently have shown that this barrier can be circumvented with effective nonlinearities produced by projective measurements, and with this work linear-optical quantum computing becomes a new possibility of scalable quantum computation. We review several issues concerning its principles and requirements.

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