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Controlled dephasing of electrons via a phase sensitive detector.
D Sprinzak1, E Buks, M Heiblum
1Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
Physical Review Letters
|September 16, 2000
Summary
We show how a detector influences quantum interference. This study explores detector noise and coherency effects on quantum dephasing in mesoscopic structures.
Area of Science:
- Quantum Physics
- Mesoscopic Physics
- Quantum Information
Background:
- Quantum interference is sensitive to environmental interactions.
- Dephasing destroys quantum superposition, a key resource for quantum technologies.
- Understanding dephasing mechanisms is crucial for developing robust quantum devices.
Purpose of the Study:
- To investigate controlled dephasing in an electronic interferometer-detector system.
- To analyze dephasing caused by which-path information and detector back-action.
- To explore the impact of detector noise and coherency on quantum dephasing.
Main Methods:
- Utilized a unique entangled interferometer-detector system in an electronic mesoscopic structure.
- Performed controlled dephasing experiments.
- Investigated the role of induced phase changes in the detector.
- Analyzed detector noise and coherency effects.
Main Results:
- Demonstrated controlled dephasing through an interferometer-detector system.
- Showed that even unmeasurable phase changes in the detector induce strong dephasing.
- Identified that detector noise and coherency play intricate roles in the dephasing process.
Conclusions:
- The detector's interaction with the interferometer significantly impacts quantum coherence.
- Quantum dephasing can be controlled and is influenced by detector properties.
- This work provides insights into fundamental quantum measurement and decoherence processes.