Probing charge fluctuator correlations using quantum dot pairs
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We study a pair of quantum dot exciton qubits interacting with a number of fluctuating charges that can induce a Stark shift of both exciton transition energies. We do this by solving the optical master equation using a numerical transfer matrix method. We find that the collective influence of the charge environment on the dots can be detected by measuring the correlation between the photons emitted when each dot is driven independently. Qubits in a common charge environment display photon bunching, if both dots are driven on resonance or if the driving laser detunings have the same sense for both qubits, and antibunching if the laser detunings have in opposite signs. We also show that it is possible to detect several charges fluctuating at different rates using this technique. Our findings expand the possibility of measuring qubit dynamics in order to investigate the fundamental physics of the environmental noise that causes decoherence.
Purohit , V , Braunecker , B & Lovett , B W 2015 , ' Probing charge fluctuator correlations using quantum dot pairs ' Physical Review. B, Condensed matter and materials physics , vol 91 , no. 24 , 245301 . DOI: 10.1103/PhysRevB.91.245301
Physical Review. B, Condensed matter and materials physics
©2015 American Physical Society. Reproduced in accordance with the publisher's author reuse policies.
V.P. is supported by the EPSRC Scottish Doctoral Training Centre in condensed matter physics (Grant No. EP/G03673X/1). B.W.L. thanks the Royal Society for financial support from a University Research Fellowship.
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