31,418 research outputs found
Exploiting Non-Markovianity of the Environment for Quantum Control
When the environment of an open quantum system is non-Markovian, amplitude
and phase flow not only from the system into the environment but also back.
Here we show that this feature can be exploited to carry out quantum control
tasks that could not be realized if the system was isolated. Inspired by recent
experiments on superconducting phase circuits, we consider an anharmonic ladder
with resonant amplitude control only. This restricts realizable operations to
SO(N). The ladder is immersed in an environment of two-level systems. Strongly
coupled two-level systems lead to non-Markovian effects, whereas the weakly
coupled ones result in single-exponential decay. Presence of the environment
allows for implementing diagonal unitaries that, together with SO(N), yield the
full group SU(N). Using optimal control theory, we obtain errors that are
solely -limited
Hot-carrier-induced deep-level defects from gated-diode measurements on MOSFETs
The reverse-bias current in the gated-diode configuration of hot-carrier degraded MOS devices was measured. It is shown that interface defects created by the degradation contribute predominantly to the generation current. The spatial distribution of the deep-level defects was obtained by means of device simulation
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