Quantum computation by measurements

Details Quantum computation by measurements Quantum computation by measurements

2003-10-31

arxiv.org/abs/quant-ph/0310189v2

IJQI, Vol. 2, No. 1 (2004) 33-43

Physics

Quantum Physics

Based on a presentation at EQIS 03, Kyoto

Scientific paper

We first consider various methods for the indirect implementation of unitary gates. We apply these methods to rederive the universality of 4-qubit measurements based on a scheme much simpler than Nielsen's original construction [quant-ph/0108020]. Then, we prove the universality of simple discrete sets of 2-qubit measurements, again using a scheme simplifying the initial construction [quant-ph/0111122]. Finally, we show how to use a single 4-qubit measurement to achieve universal quantum computation, and outline a proof for the universality of almost all maximally entangling 4-qubit measurements.

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