Experiments to Control Atom Number and Phase-Space Density in ...
Experiments to Control Atom Number and Phase-Space Density in ...
Experiments to Control Atom Number and Phase-Space Density in ...
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e split determ<strong>in</strong>istically, <strong>in</strong>itializ<strong>in</strong>g a pair of qubits.<br />
The entangled pair of a<strong>to</strong>ms can be created <strong>in</strong> the presence of a stronger ho-<br />
mogeneous magnetic field. At larger fields both a<strong>to</strong>ms are high-field seekers, but more<br />
importantly they exhibit strong repulsive <strong>in</strong>teractions. This <strong>in</strong>teraction can be used<br />
<strong>to</strong> separate the a<strong>to</strong>ms <strong>in</strong><strong>to</strong> the two separate wells. Under these conditions, where no<br />
preference of the a<strong>to</strong>ms exists <strong>to</strong> go on way or the other, an entangled pair of a<strong>to</strong>ms is<br />
created.<br />
Experimentally, additional effects <strong>in</strong>fluence the fidelity. A<strong>to</strong>ms will scatter light<br />
from the trap beam. These scatter<strong>in</strong>g events lead <strong>to</strong> vacancies with<strong>in</strong> the Fermi distri-<br />
bution <strong>and</strong> can thus lead <strong>to</strong> a reduction <strong>in</strong> the fidelity of the laser cull<strong>in</strong>g process. The<br />
use of far-detuned laser beams, where scatter<strong>in</strong>g is suppressed, mitigates this problem.<br />
Another source of possible fidelity loss stems from collisions of the trapped a<strong>to</strong>ms with<br />
background gas. Ultra-high vacuum is therefore a requirement <strong>to</strong> create an a<strong>to</strong>mic Fock<br />
state with ultra-high fidelity.<br />
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