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- W1990997025 abstract "The geometric aspects of quantum mechanics are underlined most prominently by the concept of geometric phases, which are acquired whenever a quantum system evolves along a closed path in Hilbert space. The geometric phase is determined only by the shape of this path and is -- in its simplest form -- a real number. However, if the system contains degenerate energy levels, matrix-valued geometric phases, termed non-abelian holonomies, can emerge. They play an important role for the creation of synthetic gauge fields in cold atomic gases and the description of non-abelian anyon statistics. Moreover, it has been proposed to exploit non-abelian holonomic gates for robust quantum computation. In contrast to abelian geometric phases, non-abelian ones have been observed only in nuclear quadrupole resonance experiments with a large number of spins and without fully characterizing the geometric process and its non-commutative nature. Here, we realize non-abelian holonomic quantum operations on a single superconducting artificial three-level atom by applying a well controlled two-tone microwave drive. Using quantum process tomography, we determine fidelities of the resulting non-commuting gates exceeding 95 %. We show that a sequence of two paths in Hilbert space traversed in different order yields inequivalent transformations, which is an evidence for the non-abelian character of the implemented holonomic quantum gates. In combination with two-qubit operations, they form a universal set of gates for holonomic quantum computation." @default.
- W1990997025 created "2016-06-24" @default.
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- W1990997025 date "2013-04-01" @default.
- W1990997025 modified "2023-09-30" @default.
- W1990997025 title "Experimental realization of non-Abelian non-adiabatic geometric gates" @default.
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- W1990997025 doi "https://doi.org/10.1038/nature12010" @default.
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