Mode Dependency of Quantum Decoherence Studied via an Aharonov-Bohm Interferometer
| Autor: | D. C. Ling, Yiping Lin, Cheng-Chung Chi, Tung-Sheng Lo, Phillip M. Wu, Jeng-Chung Chen |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Quantum decoherence Dephasing Mode (statistics) General Physics and Astronomy 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 01 natural sciences Interferometry Amplitude Quantum mechanics 0103 physical sciences 010306 general physics 0210 nano-technology Quantum dissipation Quantum Coherence (physics) |
| Zdroj: | Physical Review Letters. 116 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.116.080401 |
| Popis: | We investigate the dependence of decoherence on the mode number M in a multiple-mode Aharonov-Bohm (AB) interferometer. The design of the AB interferometer allows us to precisely determine M by the additivity rule of ballistic conductors; meanwhile, the decoherence rate is simultaneously deduced by the variance of the AB oscillation amplitude. The AB amplitude decreases and fluctuates with depopulating M. Moreover, the normalized amplitude exhibits a maximum at a specific M (∼9). Data analysis reveals that the charge-fluctuation-induced dephasing, which depends on the geometry and the charge relaxation resistance of the system, could play an essential role in the decoherence process. Our results suggest that the phase coherence, in principle, can be optimized using a deliberated design and pave one of the ways toward the engineering of quantum coherence. |
| Databáze: | OpenAIRE |
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