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Dynamical control of macroscopic quantum tunneling.
A Barone1, G Kurizki, A G Kofman
1Department of Physical Sciences, University of Naples Federico II, Naples, Italy 80125.
Physical Review Letters
|June 1, 2004
Summary
The quantum Zeno and anti-Zeno effects can be achieved in macroscopic quantum tunneling using current-bias modulation in Josephson junctions and similar systems. This research demonstrates a new method for controlling quantum phenomena in larger-scale systems.
Area of Science:
- Quantum physics
- Condensed matter physics
- Quantum optics
Background:
- Macroscopic quantum tunneling (MQT) is a quantum mechanical phenomenon where a system transitions between two distinct states through a potential barrier.
- The quantum Zeno effect (QZE) describes the suppression of quantum evolution due to frequent measurements, while the quantum anti-Zeno effect (QAZE) describes its acceleration.
Purpose of the Study:
- To demonstrate the experimental realization of QZE and QAZE in MQT.
- To explore the application of current-bias modulation as a control mechanism for these quantum effects.
Main Methods:
- Theoretical analysis of MQT in Josephson junctions and atomic condensates.
- Simulations of current-bias modulation effects on tunneling dynamics.
- Investigation of measurement-induced state evolution.
Main Results:
- The study shows that QZE and QAZE are achievable for MQT via current-bias modulation.
- Demonstrated feasibility in Josephson junctions and analogous atomic condensate systems.
- Established a pathway for controlling quantum tunneling dynamics.
Conclusions:
- Current-bias modulation provides a viable method for realizing QZE and QAZE in MQT.
- These findings open new avenues for quantum control and manipulation in macroscopic quantum systems.
- The results have implications for quantum computing and precision measurements.