Format results
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Quantum Estimation: Theory and Practice - Welcome
Robin Blume-Kohout - Sandia National Laboratories
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Quantum state and process estimation in trapped ion experiments
Christian Roos - Universität Innsbruck
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Quantum Tomographic Reconstruction with Error Bars: a Kalman Filter Approach
Koenraad Audenaert - University of London
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Optimal linear tomography of quantum states and processes with tight POVMs
Andrew Scott - Griffith University
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A continuous-variable approach to process tomography
Alex Lvovsky - University of Calgary
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Diagnosis of Pulsed Squeezing in Multiple Temporal Modes
Scott Glancy - National Institute of Standards and Technology
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Selective and efficient process tomography
Juan Pablo Paz - Universidad de Buenos Aires
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Entanglement and nonlocality in microscopic - macroscopic systems
FRANCESCO DE MARTINI - Sapienza University of Rome
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A new approach to Quantum Estimation: Theory and Applications
A new approach to Quantum Estimation Theory will be introduced, based on the novel notions of \'quantum comb\' and \'quantum tester\', which generalize the customary notions of \'channel\' and \'POVM\' [PRL 101 060401 (2008)]. The new approach opens completely new possibilities of optimization in… -
Quantum state and process estimation in trapped ion experiments
Christian Roos - Universität Innsbruck
The experimental realization of entangled states requires tools for characterizing the produced states as well as the processes used for creating the entanglement. In my talk, I will present examples of quantum measurements occuring in trapped ion experiments aiming at creating high-fidelity quantum… -
Quantum Tomographic Reconstruction with Error Bars: a Kalman Filter Approach
Koenraad Audenaert - University of London
We present a novel quantum tomographic reconstruction method based on Bayesian inference via the Kalman filter update equations. The method not only yields the maximum likelihood/optimal Bayesian reconstruction, but also a covariance matrix expressing the measurement uncertainties in a complete way… -
Quantum state tomography in the real world: the search for rigor by an increasingly confused experimentalist
Nathan Langford - University of Vienna
The basic principles of quantum state tomography were first outlined by Stokes for the context of light polarisation more than 150 years ago. For an experimentalist the goal is clear: to use a series of measurement outcomes to make the best possible estimate of a system\'s quantum state, including… -
Optimal linear tomography of quantum states and processes with tight POVMs
Andrew Scott - Griffith University
We introduce the concept of tight POVMs. In analogy with tight frames, these are POVMs that are as close as possible to orthonormal bases for the space they span. We show that tight rank-one POVMs define the exact class of optimal measurements for linear tomography of quantum states. In this setting… -
Pretty-Good Tomography
Scott Aaronson - The University of Texas at Austin
I\'ll survey recent results from quantum computing theory showing that,if one just wishes to learn enough about a quantum state to predictthe outcomes of most measurements that will actually be made, then itoften suffices to perform exponentially fewer measurements than wouldbe needed in quantum… -
Continuous variable two designs
Peter Turner - University of Bristol
I will discuss our ongoing attempts to construct Symmetric Informationally Complete Positive Operator Valued Measures, or (minimal) two designs, out of Gaussian states. This poses difficulties both in principle, such as how to introduce a measure on the noncompact group of symplectic transformations… -
A continuous-variable approach to process tomography
Alex Lvovsky - University of Calgary
We propose and demonstrate experimentally a technique for estimating quantum-optical processes in the continuous-variable domain. The process data is determined by applying the process to a set of coherent states and measuring the output. The process output for an arbitrary input state can then be… -
Diagnosis of Pulsed Squeezing in Multiple Temporal Modes
Scott Glancy - National Institute of Standards and Technology
When one makes squeezed light by downconversion of a pulsed pump laser, many temporal / spectral modes are simultaneously squeezed by different amounts. There is no guarantee that any of these modes matches the pump or the local oscillator used to measure the squeezing in homodyne detection… -
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Entanglement and nonlocality in microscopic - macroscopic systems
FRANCESCO DE MARTINI - Sapienza University of Rome
Theoretical and experimental results on the Quantum Injected Optical Parametric Amplification (QI-OPA) of optical qubits in the high gain regime (g > 6) are reported. The entanglement of the related Schroedinger Cat-State (SCS) is demonstrated as well as the establishment of Phase-Covariant quantum…