Publication:
Optical and spin properties of Er3+ sites in Si

dc.contributor.advisor Rogge, Sven
dc.contributor.author Berkman, Ian
dc.date.accessioned 2023-04-06T07:24:09Z
dc.date.available 2023-04-06T07:24:09Z
dc.date.issued 2023
dc.date.submitted 2023-04-06T05:41:40Z
dc.description.abstract Quantum networks are the quantum analogue of the modern internet, offering the ability to employ more secure protocols than modern communication. At the base of these quantum networks are so-called qubits: physical entities that can be in a simultaneous superposition of two states. For quantum networks, qubits should contain states that can be optically accessed and can store quantum properties for a long time. Nowadays, a number of qubit platforms exist, with spin qubits in Si offering long coherence times due to the low number of nuclear spins in the host crystal. Si is a widely used semiconductor in modern electronic devices and the maturated micro- and nanofabrication techniques can be exploited to miniaturise quantum devices. Additionally, Si and SiO2 form an attractive photonic material system because they provide a large contrast in the refractive index, which is critical for achieving efficient optical confinement. To minimise the photon losses and leverage on the well-established telecommunication networks, the photons excited from the spin states should emit within the telecommunication C-band. In this sense, Er3+:Si is an attractive system because Er3+ ions exhibit a spin transition that can be accessed by photons with frequencies within the telecommunication C-band. Moreover, the optical transition of Er3+ takes place within an inner shell, meaning that the outer shells electrically shield this transition, resulting in narrow and stable optical transitions within the telecommunication C-band. The upper bounds on the coherence times of the optical and spin transitions of Er3+:Si are, thus far, still unknown. In this thesis, these optical and spin properties of Er3+ ions in Si are investigated with the aim to create an interface between a spin qubit and a flying qubit. Here, the optical measurements include the extraction of inhomogeneous and homogeneous broadening of Er3+:Si over various samples, observing linewidths down to less than 100 MHz and 500 kHz, respectively. The low Er3+ density in natural Si samples showed characteristics of long-lived electron spin states for two sites. The electron spin coherence time of an Er3+ site in a nuclear-spin-free Si crystal was measured to be 0.5 ms by employing a Hahn echo sequence, and this was further extended up to 9 ms using a Carr–Purcell Meiboom–Gill sequence. These optical and spin properties establish that Er3+:Si exhibits fundamentally promising properties for quantum networks.
dc.identifier.uri http://hdl.handle.net/1959.4/101087
dc.language English
dc.language.iso en
dc.publisher UNSW, Sydney
dc.rights CC BY 4.0
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject.other Erbium
dc.subject.other Silicon
dc.subject.other Quantum computing
dc.subject.other Quantum networks
dc.subject.other Quantum emitter
dc.subject.other Rare-earth
dc.title Optical and spin properties of Er3+ sites in Si
dc.type Thesis
dcterms.accessRights embargoed access
dcterms.rightsHolder Berkman, Ian
dspace.entity.type Publication
unsw.accessRights.uri http://purl.org/coar/access_right/c_f1cf
unsw.date.embargo 2025-04-06
unsw.date.workflow 2023-04-06
unsw.description.embargoNote Embargoed until 2025-04-06
unsw.identifier.doi https://doi.org/10.26190/unsworks/24794
unsw.relation.faculty Science
unsw.relation.school School of Physics
unsw.relation.school Centre for Quantum Computation & Communication Technology
unsw.subject.fieldofresearchcode 5108 Quantum physics
unsw.thesis.degreetype PhD Doctorate
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