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Quantum metrology with nonclassical states of atomic ensembles
Quantum technologies exploit entanglement to revolutionize computing, measurements, and communications. This has stimulated the research in different areas of physics to engineer and manipulate…
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Entanglement, nonlinear dynamics, and the heisenberg limit.
TLDR
The analysis singles out the class of entangled states which are useful to overcome classical phase sensitivity in metrology and sensors and studies the creation of useful entangled states by the nonlinear dynamical evolution of two decoupled Bose-Einstein condensates or trapped ions.
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Twin Matter Waves for Interferometry Beyond the Classical Limit
TLDR
This work used spin dynamics in Bose-Einstein condensates to create large ensembles of up to 104 pair-correlated atoms with an interferometric sensitivity beyond the shot noise limit, and points the way toward a new generation of atom interferometers.
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Fisher information and entanglement of non-Gaussian spin states
TLDR
A general method is developed to extract the Fisher information, which reveals that the quantum dynamics of a classically unstable system creates quantum states that are not spin squeezed but nevertheless entangled, which quantifies metrologically useful entanglement.
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Quantum theory of phase estimation
Advancements in physics are often motivated/accompanied by advancements in our precision measurements abilities. The current generation of atomic and optical interferometers is limited by shot noise,…
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Mach-Zehnder interferometry at the Heisenberg limit with coherent and squeezed-vacuum light.
We show that the phase sensitivity Deltatheta of a Mach-Zehnder interferometer illuminated by a coherent state in one input port and a squeezed-vacuum state in the other port is (i) independent of…
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Metrological Nonlinear Squeezing Parameter.
TLDR
These results lead to optimized and experimentally feasible recipes for a high-precision moment-based estimation of a phase parameter and can be used to systematically construct multipartite entanglement and nonclassicality witnesses for complex quantum states.
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Optimal Measurements for Simultaneous Quantum Estimation of Multiple Phases.
TLDR
It is derived necessary and sufficient conditions for projective measurements acting on pure states to saturate the ultimate theoretical bound on precision given by the quantum Fisher information matrix.
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Ultrasensitive two-mode interferometry with single-mode number squeezing.
TLDR
Here it is shown that above the shot-noise limit the sensitivity of two-mode interferometers can be significantly enhanced by squeezing in input, and then measuring in output, the population fluctuations of a single mode.
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Entanglement and sensitivity in precision measurements with states of a fluctuating number of particles.
TLDR
This manuscript generalizes the concepts of separability, entanglement, spin squeezing, and the Heisenberg limit and extends the quantum phase estimation theory by taking into account classical and quantum fluctuations of the particle number.
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