41,805 research outputs found
Manipulating growth and propagation of correlations in dipolar multilayers: From pair production to bosonic Kitaev models
We study the non-equilibrium dynamics of dipoles confined in multiple stacked
two-dimensional layers realising a long-range interacting quantum spin 1/2 XXZ
model. We demonstrate that strong in-plane XXX interactions can protect a
manifold of collective layer dynamics. This then allows us to map the many-body
spin dynamics to bosonic models. In a bilayer configuration we show how to
engineer the paradigmatic two-mode squeezing Hamiltonian known from quantum
optics, resulting in exponential production of entangled pairs and generation
of metrologically useful entanglement from initially prepared product states.
In multi-layer configurations we engineer a bosonic variant of the Kitaev model
displaying chiral propagation along the layer direction. Our study illustrates
how the control over interactions, lattice geometry and state preparation in
interacting dipolar systems uniquely afforded by AMO platforms such as Rydberg
and magnetic atoms, polar molecules or trapped ions allow for the control over
the temporal and spatial propagation of correlations for applications in
quantum sensing and quantum simulation.Comment: 5 pages, 4 figures + references + supplemen
A Rydberg ion flywheel for quantum work storage
Trapped ions provide a platform for quantum technologies that offers long
coherence times and high degrees of scalability and controllability. Here, we
use this platform to develop a realistic model of a thermal device consisting
of two laser-driven, strongly coupled Rydberg ions in a harmonic trap. We show
that the translational degrees of freedom of this system can be utilized as a
flywheel storing the work output that is generated by a cyclic thermodynamic
process applied to its electronic degrees of freedom. Mimicking such a process
through periodic variations of external control parameters, we use a mean-field
approach underpinned by exact numerical and analytical calculations to identify
relevant physical processes and to determine the charging rate of the flywheel.
Our work paves the way for the design of microscopic thermal machines based on
Rydberg ions that can be equipped with both many-body working media and
universal work storages.Comment: 11 pages, 5 figure
From Quantum Optics to Quantum Technologies
Quantum optics is the study of the intrinsically quantum properties of light.
During the second part of the 20th century experimental and theoretical
progress developed together; nowadays quantum optics provides a testbed of many
fundamental aspects of quantum mechanics such as coherence and quantum
entanglement. Quantum optics helped trigger, both directly and indirectly, the
birth of quantum technologies, whose aim is to harness non-classical quantum
effects in applications from quantum key distribution to quantum computing.
Quantum light remains at the heart of many of the most promising and
potentially transformative quantum technologies. In this review, we celebrate
the work of Sir Peter Knight and present an overview of the development of
quantum optics and its impact on quantum technologies research. We describe the
core theoretical tools developed to express and study the quantum properties of
light, the key experimental approaches used to control, manipulate and measure
such properties and their application in quantum simulation, and quantum
computing.Comment: 20 pages, 3 figures, Accepted, Prog. Quant. Ele
Trapped ions in optical lattices for probing oscillator chain models
We show that a chain of trapped ions embedded in microtraps generated by an
optical lattice can be used to study oscillator models related to dry friction
and energy transport. Numerical calculations with realistic experimental
parameters demonstrate that both static and dynamic properties of the ion chain
change significantly as the optical lattice power is varied. Finally, we lay
out an experimental scheme to use the spin degree of freedom to probe the phase
space structure and quantum critical behavior of the ion chain
Implementation of quantum gates and preparation of entangled states in cavity QED with cold trapped ions
We propose a scheme to perform basic gates of quantum computing and prepare
entangled states in a system with cold trapped ions located in a single mode
optical cavity. General quantum computing can be made with both motional state
of the trapped ion and cavity state being qubits. We can also generate
different kinds of entangled states in such a system without state reduction,
and can transfer quantum states from the ion in one trap to the ion in another
trap. Experimental requirement for achieving our scheme is discussed.Comment: To appear in J. Opt.
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