Superconducting qubit without Josephson junctions manipulated by the
orbital angular momentum of light
release_rev_b8cc4570-b469-4894-8f96-29b7d5a2b50f
by
Sang Jae Yun
2015
Abstract
Conventional superconducting qubits have used Josephson junctions as an
essential part to provide anharmonicity for well-separated energy-level
spacings. However, because a superconducting ring without Josephson junctions
has intrinsically well-separated energy-level spacings, Josephson junctions are
not necessary as long as one can achieve single-qubit operations. We show that
the orbital angular momentum of light can be adopted as a qubit-control means
and can eliminate the need for Josephson junctions. The feasibility study
reveals that the proposed qubit has many advantages over the previous ones. The
lifetime of the qubit is extended due to the lack of the junction resistance.
Very fast (sub-nanosecond) qubit manipulation in both single- and two-qubit
gate is achieved. Without Josephson junctions, the fabrication process is
simple and the deviations in the characteristics of each qubit can be improved.
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1505.04257v2
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