Quantum measurement of coherent tunneling between quantum dots
We describe the conditional and unconditional dynamics of two coupled quantum dots when one dot is subjected to a measurement of its occupation number by coupling it to a third readout dot via the Coulomb interaction. The readout dot is coupled to source and drain leads under weak bias, and a tunnel current flows through a single bound state when energetically allowed. The occupation of the quantum dot near the readout dot shifts the bound state of the readout dot from a low conducting state to a high conducting state. The measurement is made by continuously monitoring the tunnel current through the readout dot. We show that there is a difference between the time scale for the measurement-induced decoherence between the localized states of the dots, and the time scale on which the system becomes localized due to the measurement.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40203582
- Journal Information:
- Physical Review B, Vol. 63, Issue 23; Other Information: DOI: 10.1103/PhysRevB.63.235308; Othernumber: PRBMDO000063000023235308000001; 068120PRB; PBD: 15 Jun 2001; ISSN 0163-1829
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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