Decoherence enhanced quantum measurement of a quantum dot spin qubit
| Autor: | Roszak, Katarzyna, Marcinowski, Łukasz, Machnikowski, Paweł |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 91, 032118 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.91.032118 |
| Popis: | We study the effect of phonons on a proposed scheme for the direct measurement of two-electron spin states in a double quantum dot by monitoring the the noise of the current flowing through a quantum point contact coupled to one of the dots. We show that although the effect of phonons is damaging to the procedure at extremely low temperatures characteristic of spin-in-quantum-dots experiments, and may even be fatal, increasing the temperature leads to a revival of the schemes usefulness. Furthermore, at higher, but still reasonably low temperatures phonon effects become advantageous to the measurement scheme, and lead to the enhancement of the spin-singlet noise without disturbing the low spin-triplet noise. Hence, the uncontrollable interaction of the measured system with the open bosonic environment, can be harnessed to increase the distinguishability between the measured states. Comment: 5 pages, 1 figure |
| Databáze: | arXiv |
| Externí odkaz: |
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