Observation of flux qubit states with the help of a superconducting differential double contour interferometer |
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Institution: | Institute of Microelectronics Technology, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russia |
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Abstract: | The critical current of a new structure, the superconducting differential double contour interferometer (DDCI), investigated recently, depends on the parity of the sum of quantum numbers of the two superconducting loops connected in two points by two Josephson junctions. The theory confirms that the DDCI structure can be used for the ideal readout of quantum states of the flux qubit. Large jumps in the critical current and voltage enables to observe continuously the change in time the state of the flux qubit. Such observations can have fundamental importance for the investigation of macroscopic quantum systems with strongly discrete spectrum such as the flux qubit. The DDCI structure can also be used for precise measurement of a very weak magnetic field. |
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Keywords: | Superconducting quantum bit Flux qubit Bohr's quantization of Cooper pairs Phase coherence Discrete spectrum of permitted states Superconducting differential double contour interferometer |
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