Matchgate quantum computing and non-local process analysis

Details Matchgate quantum computing and non-local process analysis Matchgate quantum computing and non-local process analysis

2009-09-16

arxiv.org/abs/0909.3016v3

New J. Phys. 12 (2010) 083027

Physics

Quantum Physics

* published version * extended title reflecting the additions on non-local process analyis in the manuscript

Scientific paper

10.1088/1367-2630/12/8/083027

In the circuit model, quantum computers rely on the availability of a universal quantum gate set. A particularly intriguing example is a set of two-qubit only gates: matchgates, along with SWAP (the exchange of two qubits). In this paper, we show a simple decomposition of arbitrary matchgates into better known elementary gates, and implement a matchgate in a linear-optics experiment using single photons. The gate performance was fully characterized via quantum process tomography. Moreover, we represent the resulting reconstructed quantum process in a novel way, as a fidelity map in the space of all possible nonlocal two-qubit unitaries. We propose the non-local distance - which is independent of local imperfections like uncorrelated noise or uncompensated local rotations - as a new diagnostic process measure for the non-local properties of the implemented gate.

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