Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"spin squeezing"”.
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Spin-squeezing of ⁸⁷Rb via optical measurement
… measurement uncertainty in atomic clocks by squeezing the collective spin of atoms. Spin-squeezing reduces noise below the standard quantum limit where precision scales as 1/ [square root of] N, allowing us to instead approach the Heisenberg limit where it scales as 1/N. We report …
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Cavity-enabled spin squeezing for a quantum-enhanced atomic clock
… type of entangled state called a "squeezed spin state." The generation of non-classical spin correlations in a dilute cloud of atoms is facilitated by an optical cavity, which allows for strong collective coupling of the atomic ensemble to a single mode of light. Since the light exiting the …
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Towards spin squeezed ¹⁷¹Yb atomic clock beyond the standard quantum limit
… projection noise, which can be overcome by spin squeezing. We constructed an apparatus to perform spin squeezing on an ytterbium optical lattice clock to demonstrate the enhancement of clock stability by spin squeezing. Using the spin 1/2 system of the ground state Zeeman sublevels of 171Yb, …
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COMBINING QUANTUM TRAJECTORIES AND TIME-DEPENDENT VARIATIONAL MONTE CARLO FOR MANY-BODY OPEN QUANTUM SYSTEMS
… complexity. Applied to a dissipative many-body spin system with long-range interactions, this method successfully simulates up to 180 spins and provides insights into time evolution of the spin-squeezing parameter. Despite some limitations, such as potential biases and challenges with accuracy …
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Coherent control of dipolar coupled spins in large Hilbert spaces
Controlling the dynamics of a dipolar-coupled spin system is critical to the development of solid-state spin-based quantum information processors. Such control remains challenging, as every spin is coupled to a large number of surrounding spins. In this thesis, we primarily focus on developing …
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Exploring spin physics with ultracold atoms
The dynamics of many interacting spins is an active frontier of research; not only can they explain magnetic phenomena, but they also provide paradigmatic models with deep connections to high-T_c superconductivity, optimization problems, neural networks, and more. Experiments with ultracold alkali …
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Cavity quantum electrodynamics with ensembles of ytterbium-171
… probing light on the atomic ensemble, we perform squeezing by cavity feedback. We produce states with -11±1 dB of variance squeezing and 14±1 dB of anti squeezing. Using theoretical simulations, we show that states with near-unitary squeezing offer significant advantages for improving atomic …
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Exploring Novel Quantum Physics Using Ytterbium-171 in An Optical Cavity
… theoretical framework that describes CQED spin systems. We unify the two major roles of cavity light: the measurement of the atomic state and the catalyst for generating entanglement. The obtained model agrees well with the experimental results. We utilize this framework to implement and …
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Momentum-space lattices for ultracold atoms
… in an internal degree of freedom, such as spin, or, in our case, in the dynamics of free-particle-like atomic momentum states. We expose a Bose–Einstein condensate to two laser fields that are capable of driving transitions between different momentum states of the condensate atoms through a …