Abstract
Received 2 February 1999 We report on measurements of single-Cooper-pair charging effects in small Josephson junction arrays, and the experimental techniques that were used. We succeeded in having complete control over the array’s electrostatic parameters; offset charges were accurately compensated, and the poisoning of 2e-periodic effects by quasiparticles was circumvented. This allowed for a controlled study of the array’s coherent ground state. A few measurements gave results which were not fully 2e-periodic due to interesting parity effects. The arrays are in the regime where the energy scales for the Josephson effect and single-charge effects are comparable.
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