Abstract
Several experiments have shown the existence of coherent superposition of different charge states in Single Cooper Pair Tunneling (SPT) devices [1, 2]. This makes these devices potential candidates for quantum computing qubits. Existing theoretical proposals [3, 4] show in detail how to realize all necessary qubit operations including entanglement and readout using these so-called charge qubits. However, the practical implementation of charge qubits is hindered by two major road blocks: charge noise and quasiparticle poisoning. The first results from the movement of background charges in the substrate or in the oxide layer of device. The latter results from the entry of a single unpaired electron onto the island of the device. In this paper we investigate quasiparticle poisoning and present data for the timescale on which it occurs.
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