Generation and Manipulation of Entanglement in Quantum Optical Systems

Abstract

In this thesis, several new procedures for the generation and manipulation of entangled states in quantum optical systems are introduced. Each is evaluated in terms of realistic models of the imperfect apparatus of any real laboratory implementation. The first half of the thesis considers entanglement generation in Cavity QED, introducing several proposals for the creation of maximally entangled two-qubit states. The second half of the thesis focuses on the manipulation of entangled states of light pulses. In particular, an entanglement distillation procedure for Gaussian states is introduced. This combines a Procrustean protocol for the generation of highly entangled non-Gaussian states, with a "Gaussification" procedure, which allows more highly entangled approximately Gaussian states to be distilled from a non-Gaussian supply.

PhD Thesis (December 2004), Imperial College London, 165 pages

References in corpus (63)

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• Quantifying Entanglement
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• Quantum Games and Quantum Strategies
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• Quantum oscillations in two coupled charge qubits
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• Continuous variable quantum cryptography
• On the impossibility of distilling Gaussian states with Gaussian operations
• Creation of entangled states of distant atoms by interference
• The characterization of Gaussian operations and Distillation of Gaussian States
• Proposal for teleportation of an atomic state via cavity decay
• Dense Coding for Continuous Variables
• Bound entangled Gaussian states
• "Squashed Entanglement" - An Additive Entanglement Measure
• Thermodynamics and the Measure of Entanglement
• Non-gaussian statistics from individual pulses of squeezed light
• Gaussian transformations and distillation of entangled Gaussian states
• Efficient engineering of multi-atom entanglement through single-photon detections
• Trapping of single atoms in cavity QED
• Continuous Variable Quantum Cryptography - beating the 3 dB loss limit
• Generation of Continuous Variable Einstein-Podolsky-Rosen Entanglement via the Kerr Nonlinearity in an Optical Fibre
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• Quantum key distribution with bright entangled beams
• A uniqueness theorem for entanglement measures
• Unified derivations of measurement-based schemes for quantum computation
• Polarization Squeezing of Continuous Variable Stokes Parameters
• Entanglement generation and degradation by passive optical devices
• The Quantum State of an Ideal Propagating Laser Field
• Operational Theory of Homodyne Detection
• Robust generation of entanglement between two cavities mediated by short interactions with an atom
• Kraus representation in the presence of initial correlations
• General implementation of all possible positive-operator-value measurements of single photon polarization states
• Two Mode Quantum Systems: Invariant Classification of Squeezing Transformations and Squeezed States
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• Entanglement Manipulation and Concentration
• Decoherence in collective quantum memories for photons
• Mixed State Entanglement: Manipulating Polarisation-Entangled Photons