Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702451
Title: Photonic quantum states for measurement
Author: Whittaker, Rebecca
ISNI:       0000 0004 6057 8699
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2016
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Abstract:
Using quantum states for measurement teaches us about fundamental properties of quantum mechanics, while also opening up their application to technology. These technologies promise to harness quantum mechanics in order to out-perform current devices based on classical physics. There are many interesting properties arising from quantum mechanical states that set them apart from classical states of light. Through the use of different types of laser, different types of birefringent crystals and different assembly of the birefringent crystals, we can produce a variety of photonic quantum states. With this toolbox available to us, we are able to tailor the type of state to use in order to perform a particular measurement. In the work in this thesis we explore three different properties from specific photonic quantum states in order to measure three very different things. We make use of the high-frequency probability fringes from balanced multi-photon Fock states to estimate unknown processes; we make use of the relationship between the . number of photons in a photonic state to the degree of polynomials in the matrix elements of unitary operators to measure the level of randomness of finite ensembles of unitary operators; and we use the way in which loss modifies a single-photon Fock state in order to make absorption measurements with precision approaching the ultimate quantum limit.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.702451  DOI: Not available
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