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dc.contributor.author
Delley, Yves Léandre
dc.contributor.supervisor
Imamoglu, Atac
dc.contributor.supervisor
Finley, Jonathan
dc.date.accessioned
2017-09-08T08:47:00Z
dc.date.available
2017-09-08T08:40:42Z
dc.date.available
2017-09-08T08:47:00Z
dc.date.issued
2017
dc.identifier.uri
http://hdl.handle.net/20.500.11850/183694
dc.identifier.doi
10.3929/ethz-b-000183694
dc.description.abstract
We explore the prospects of using doubly charged, optically active, self-assembled quantum dot molecules in the (1,1) regime as a spin–photon interface. Using optical means, we investigate the coherence properties of the singlet–triplet subspace in the vicinity of the sweet spot, where that subspace becomes atomic-clock like. We compare frequency domain measurements, making use of coherent population trapping, with time domain measurements based on coherent spin control. We find T2∗ coherence times in the range of 10 ns to 200 ns, determined by charge fluctuations that vary from sample to sample. In conjunction with measurements of the Hahn spin echo, which we observe for up to 300 ns, we conclude that additional sources of decoherence are playing a role. We report a spin-measurement protocol making use of ancillary optical cycling transitions present in the system. We find an improvement of detection efficiency by two orders of magnitude compared to conventional direct optical spin detection, suggesting single-shot readout to be achievable. The principal result of this thesis is the demonstration of the coherence of the optical interaction by quantifying the amount of entanglement between a spontaneously emitted single photon and the resident pseudo-spin. A visibility of the quantum coherence approaching 50 %, together with strong classical correlations unambiguously prove quantum entanglement between the two systems.
en_US
dc.language.iso
en
en_US
dc.publisher
ETH Zurich
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.subject
Quantum coherence
en_US
dc.subject
Quantum communication
en_US
dc.subject
Quantum entanglement
en_US
dc.subject
Self-assembled quantum dots
en_US
dc.title
Realisation of a spin–photon interface using singlet–triplet qubits in self-assembled quantum dot molecules
en_US
dc.type
Doctoral Thesis
dc.rights.license
In Copyright - Non-Commercial Use Permitted
dc.date.published
2017-09-08
ethz.size
127 p.
en_US
ethz.identifier.diss
24174
en_US
ethz.publication.place
Zurich
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02510 - Institut für Quantenelektronik / Institute for Quantum Electronics::03636 - Imamoglu, Atac / Imamoglu, Atac
en_US
ethz.date.deposited
2017-09-08T08:40:43Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-09-08T08:47:04Z
ethz.rosetta.lastUpdated
2018-11-05T19:23:04Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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