Malein, R.N.E., Santana, T.S., Zajac, J.M., Dada, A.C. , Gauger, E.M., Petroff, P.M., Lim, J.Y., Song, J.D. and Gerardot, B.D. (2016) Screening nuclear field fluctuations in quantum dots for indistinguishable photon generation. Physical Review Letters, 116(25), 257401. (doi: 10.1103/PhysRevLett.116.257401)
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Abstract
A semiconductor quantum dot can generate highly coherent and indistinguishable single photons. However, intrinsic semiconductor dephasing mechanisms can reduce the visibility of two-photon interference. For an electron in a quantum dot, a fundamental dephasing process is the hyperfine interaction with the nuclear spin bath. Here we directly probe the consequence of the fluctuating nuclear spins on the elastic and inelastic scattered photon spectra from a resident electron in a single dot. We find the nuclear spin fluctuations lead to detuned Raman scattered photons which are distinguishable from both the elastic and incoherent components of the resonance fluorescence. This significantly reduces two-photon interference visibility. However, we demonstrate successful screening of the nuclear spin noise which enables the generation of coherent single photons that exhibit high visibility two-photon interference.
| Item Type: | Articles |
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| Additional Information: | This work was supported by the EPSRC (Grants No. EP/ I023186/1, No. EP/K015338/1, and No. EP/G03673X/1) and by ERC Starting Grant No. 307392. B. D. G. thanks the Royal Society and E. M. G. thanks the Royal Society of Edinburgh for their personal research fellowships. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Dada, Dr Adetunmise |
| Authors: | Malein, R.N.E., Santana, T.S., Zajac, J.M., Dada, A.C., Gauger, E.M., Petroff, P.M., Lim, J.Y., Song, J.D., and Gerardot, B.D. |
| College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
| Journal Name: | Physical Review Letters |
| Publisher: | American Physical Society |
| ISSN: | 0031-9007 |
| ISSN (Online): | 1079-7114 |
| Copyright Holders: | Copyright © 2016 American Physical Society |
| First Published: | First published in Physical Review Letters 116(25): 257401 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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