25 May 2004 Coupled Josephson quantum bits
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Proceedings Volume 5472, Noise and Information in Nanoelectronics, Sensors, and Standards II; (2004) https://doi.org/10.1117/12.547408
Event: Second International Symposium on Fluctuations and Noise, 2004, Maspalomas, Gran Canaria Island, Spain
Abstract
The technologies of Josephson-junction-based qubits have been progressing rapidly, ever since its first demonstration by a superconducting charge qubit1. A variety of systems have been implemented with remarkable progress in coherence time and read-out schemes. Although the current level of this solid-state device is still not as advanced as that of the most advanced microscopic-system-based qubits, these developments, together with the potential scalability, have renewed its position as a strong candidate as a building block for the quantum computer. Recently, coherent oscillation and microwave spectroscopy in capacitively-coupled superconducting qubits have been reported. The next challenging step toward quantum computation is a realization of logic gates. Here we demonstrate a conditional gate operation using a pair of coupled superconducting charge qubits. Using a pulse technique, we prepare different input states and show that they can be transformed by controlled-NOT (C-NOT) gate operation in the amplitude of the states. Although the phase evolution during the gate operation is still to be clarified, the present results are a major step toward the realization of a universal solid-state quantum gate.
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Jaw-Shen Tsai, Jaw-Shen Tsai, T. Yamamoto, T. Yamamoto, Yu. A. Pashkin, Yu. A. Pashkin, O. Astafiev, O. Astafiev, Y. Nakamura, Y. Nakamura, } "Coupled Josephson quantum bits", Proc. SPIE 5472, Noise and Information in Nanoelectronics, Sensors, and Standards II, (25 May 2004); doi: 10.1117/12.547408; https://doi.org/10.1117/12.547408
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