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- W2109935563 abstract "A new technique for controlling the quantum state of a superconducting qubit is now presented. Microwave pulses are applied in such a way that they excite only one of a pair of degenerate states. The concept enables construction of a controlled-NOT gate, a device important for quantum logic. Controlled manipulation of quantum states is central to studying natural and artificial quantum systems. If a quantum system consists of interacting subunits, the nature of the coupling may lead to quantum levels with degenerate energy differences. This degeneracy makes frequency-selective quantum operations impossible. For the prominent group of transversely coupled two-level systems, that is, qubits, we introduce a method to selectively suppress one transition of a degenerate pair while coherently exciting the other, effectively creating artificial selection rules. It requires driving two qubits simultaneously with the same frequency and specified relative amplitude and phase. We demonstrate our method on a pair of superconducting flux qubits1. It can directly be applied to the other superconducting qubits2,3,4,5,6, and to any other qubit type that allows for individual driving. Our results provide a single-pulse controlled-NOT gate for the class of transversely coupled qubits." @default.
- W2109935563 created "2016-06-24" @default.
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- W2109935563 date "2010-08-01" @default.
- W2109935563 modified "2023-10-16" @default.
- W2109935563 title "Selective darkening of degenerate transitions demonstrated with two superconducting quantum bits" @default.
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- W2109935563 doi "https://doi.org/10.1038/nphys1733" @default.
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