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Quantum Gate for Kerr-Nonlinear Parametric Oscillator Using Effective Excited States.
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In this article, the authors proposed a method for a high-fidelity $R_x$ gate by exciting the KPO outside the qubit space parity-selectively, which can be implemented by only adding a driving field.Abstract:
A Kerr-nonlinear parametric oscillator (KPO) can stabilize a quantum superposition of two coherent states with opposite phases, which can be used as a qubit. In a universal gate set for quantum computation with KPOs, an $R_x$ gate, which interchanges the two coherent states, is relatively hard to perform owing to the stability of the two states. We propose a method for a high-fidelity $R_x$ gate by exciting the KPO outside the qubit space parity-selectively, which can be implemented by only adding a driving field. In this method, utilizing higher effective excited states leads to a faster $R_x$ gate, rather than states near the qubit space. The proposed method can realize a continuous $R_x$ gate, and thus is expected to be useful for, e.g., recently proposed variational quantum algorithms.read more
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Two-photon driven Kerr quantum oscillator with multiple spectral degeneracies
TL;DR: In this paper , the detuning of the two-photon drive with respect to the oscillator resonance has been shown to play a crucial role in the properties of the defined qubit.
References
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TL;DR: Shortcuts to adiabaticity (STA) as mentioned in this paper is a systematic approach to accomplish the same final state transfer in a faster manner, which is used for atomic and molecular physics.
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TL;DR: In this paper, it was shown that quantum computation circuits using coherent states as the logical qubits can be constructed from simple linear networks, conditional photon measurements, and small coherent superposition resource states.