Optical implementations, oracle equivalence, and the Bernstein-Vazirani algorithm

Details Optical implementations, oracle equivalence, and the Bernstein-Vazirani algorithm Optical implementations, oracle equivalence, and the Bernstein-Vazirani algorithm

2006-05-10

arxiv.org/abs/quant-ph/0605092v2

JOSA B, Vol. 24, 221-225 (2007)

Physics

Quantum Physics

Published version reference added

Scientific paper

We describe a new implementation of the Bernstein-Vazirani algorithm which relies on the fact that the polarization states of classical light beams can be cloned. We explore the possibility of computing with waves and discuss a classical optical model capable of implementing any algorithm (on $n$ qubits) that does not involve entanglement. The Bernstein-Vazirani algorithm (with a suitably modified oracle), wherein a hidden $n$ bit vector is discovered by one oracle query as against $n$ oracle queries required classically, belongs to this category. In our scheme, the modified oracle is also capable of computing $f(x)$ for a given $x$, which is not possible with earlier versions used in recent NMR and optics implementations of the algorithm.

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