AI Article Synopsis
- The study shows how a beam splitter, when paired with various light sources, can efficiently clone a single photon into two identical photons and perform a quantum NOT operation on a photon’s polarization.
- Cloning requires a source of single photons with mixed polarization, while performing the NOT operation needs maximally entangled photon pairs.
- The authors achieved both tasks with high accuracy and suggest that this method could also be adapted for cloning and flipping the spin state of electrons.
Article Abstract
We demonstrate how a beam splitter in combination with different light sources can be used as an optimal universal 1-->2 quantum cloner and as an optimal universal quantum NOT machine for the polarization qubit of a single photon. For the cloning a source of single photons with maximally mixed polarization is required and for the NOT operation a source of maximally entangled photon pairs. We demonstrate both operations with near optimal fidelity. Our scheme can be generalized in a natural way to clone and NOT the spin state of electrons.
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| http://dx.doi.org/10.1103/PhysRevLett.92.047902 | DOI Listing |
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