Experimental determination of the Berry phase in a superconducting charge pump

Abstract

We present the first measurements of the Berry phase in a superconducting Cooper pair pump. A fixed amount of Berry phase is accumulated to the quantum-mechanical ground state in each adiabatic pumping cycle, which is determined by measuring the charge passing through the device. The dynamic and geometric phases are identified and measured quantitatively from their different response when pumping in opposite directions. Our observations, in particular, the dependencies of the dynamic and geometric effects on the superconducting phase bias across the pump, agree with the basic theoretical model of coherent Cooper pair pumping.

4 pages, 3 figures

References in corpus (7)

• Decoherence of flux qubits due to 1/f flux noise
• Observation of Berry's Phase in a Solid State Qubit
• Measurement scheme of the Berry phase in superconducting circuits
• Nanoampere pumping of Cooper pairs
• Connecting Berry's phase and the pumped charge in a Cooper pair pump
• Non-abelian superconducting pumps
• Topological quantization by controlled paths: application to Cooper pairs pumps

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