Raman memory for entanglement in diamonds and light storage in optical fibres
<p>Light, when reduced to the level of individual quanta, can possess, besides its familiar properties of wavelength, direction, and polarization, a set of correlations irreducible to classical correlations, among other peculiar behaviour. These correlated states are intrinsically interesting,...
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| Format: | Thesis |
| Language: | English |
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2014
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| _version_ | 1826281476632608768 |
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| author | Sprague, M |
| author2 | Walmsley, I |
| author_facet | Walmsley, I Sprague, M |
| author_sort | Sprague, M |
| collection | OXFORD |
| description | <p>Light, when reduced to the level of individual quanta, can possess, besides its familiar properties of wavelength, direction, and polarization, a set of correlations irreducible to classical correlations, among other peculiar behaviour. These correlated states are intrinsically interesting, and are also useful for quantum-enhanced information processing. In this thesis, I use a high-bandwidth, far-off-resonant Raman memory to implement two quantum information primitives -- entanglement generation and light storage -- at room temperature and ambient conditions. Specifically, I show, for the first time, the entanglement of two solid-state objects at room temperature and, also, the storage of light in a hollow-core optical fibre.</p> <p>In the first part, I show that the optical phonon modes of two diamonds can be entangled -- the prototypical non-classical correlation -- at room temperature. The entanglement was generated by spontaneous Raman scattering with projective measurements using single-photon detectors. The degree of entanglement was rigorously quantified by measuring the concurrence -- an entanglement monotone -- of the joint state of the scattered optical fields. In the second part, I store light in the coherent superposition of cesium atoms confined within a kagome-structured hollow-core photonic crystal fibre at room temperature using a far-off-resonant stimulated Raman interaction. The storage efficiency of the memory was 27$pm$1% and the noise level was sufficiently low such that single-photon-level pulses could be stored. Taken together, these results highlight the potential of Raman memories for quantum information tasks in noisy systems with short coherence times.</p> |
| first_indexed | 2024-03-07T00:29:23Z |
| format | Thesis |
| id | oxford-uuid:7f3d03f3-d47d-4871-8d59-268b301e1b8d |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:29:23Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | oxford-uuid:7f3d03f3-d47d-4871-8d59-268b301e1b8d2022-03-26T21:15:35ZRaman memory for entanglement in diamonds and light storage in optical fibresThesishttp://purl.org/coar/resource_type/c_db06uuid:7f3d03f3-d47d-4871-8d59-268b301e1b8dAtomic and laser physicsEnglishOxford University Research Archive - Valet2014Sprague, MWalmsley, I<p>Light, when reduced to the level of individual quanta, can possess, besides its familiar properties of wavelength, direction, and polarization, a set of correlations irreducible to classical correlations, among other peculiar behaviour. These correlated states are intrinsically interesting, and are also useful for quantum-enhanced information processing. In this thesis, I use a high-bandwidth, far-off-resonant Raman memory to implement two quantum information primitives -- entanglement generation and light storage -- at room temperature and ambient conditions. Specifically, I show, for the first time, the entanglement of two solid-state objects at room temperature and, also, the storage of light in a hollow-core optical fibre.</p> <p>In the first part, I show that the optical phonon modes of two diamonds can be entangled -- the prototypical non-classical correlation -- at room temperature. The entanglement was generated by spontaneous Raman scattering with projective measurements using single-photon detectors. The degree of entanglement was rigorously quantified by measuring the concurrence -- an entanglement monotone -- of the joint state of the scattered optical fields. In the second part, I store light in the coherent superposition of cesium atoms confined within a kagome-structured hollow-core photonic crystal fibre at room temperature using a far-off-resonant stimulated Raman interaction. The storage efficiency of the memory was 27$pm$1% and the noise level was sufficiently low such that single-photon-level pulses could be stored. Taken together, these results highlight the potential of Raman memories for quantum information tasks in noisy systems with short coherence times.</p> |
| spellingShingle | Atomic and laser physics Sprague, M Raman memory for entanglement in diamonds and light storage in optical fibres |
| title | Raman memory for entanglement in diamonds and light storage in optical fibres |
| title_full | Raman memory for entanglement in diamonds and light storage in optical fibres |
| title_fullStr | Raman memory for entanglement in diamonds and light storage in optical fibres |
| title_full_unstemmed | Raman memory for entanglement in diamonds and light storage in optical fibres |
| title_short | Raman memory for entanglement in diamonds and light storage in optical fibres |
| title_sort | raman memory for entanglement in diamonds and light storage in optical fibres |
| topic | Atomic and laser physics |
| work_keys_str_mv | AT spraguem ramanmemoryforentanglementindiamondsandlightstorageinopticalfibres |