3 research outputs found
Local Purity Distillation in Quantum Systems: Exploring the Complementarity Between Purity and Entanglement
Quantum thermodynamics and quantum entanglement represent two pivotal quantum
resource theories with significant relevance in quantum information science.
Despite their importance, the intricate relationship between these two theories
is still not fully understood. Here, we delve into the interplay between
entanglement and thermodynamics, particularly in the context of local cooling
processes. We introduce and develop the framework of Gibbs-preserving local
operations and classical communication. Within this framework, we explore
strategies enabling remote parties to effectively cool their local systems to
the ground state. Our analysis is centered on scenarios where only a single
copy of a quantum state is accessible, with the ideal performance defined by
the highest possible fidelity to the ground state achievable under these
constraints. We focus on systems with fully degenerate local Hamiltonians,
where local cooling aligns with the extraction of local purity. In this
context, we establish a powerful link between the efficiency of local purity
extraction and the degree of entanglement present in the system, a concept we
define as purity-entanglement complementarity. Moreover, we demonstrate that in
many pertinent scenarios, the optimal performance can be precisely determined
through semidefinite programming techniques. Our findings open doors to various
practical applications, including techniques for entanglement detection and
estimation. We demonstrate this by evaluating the amount of entanglement for a
class of bound entangled states.Comment: 5+4 pages, 4 figure
Micro-Dumbbells—A Versatile Tool for Optical Tweezers
Manipulation of micro- and nano-sized objects with optical tweezers is a well-established, albeit still evolving technique. While many objects can be trapped directly with focused laser beam(s), for some applications indirect manipulation with tweezers-operated tools is preferred. We introduce a simple, versatile micro-tool operated with holographic optical tweezers. The 40 µm long dumbbell-shaped tool, fabricated with two-photon laser 3D photolithography has two beads for efficient optical trapping and a probing spike on one end. We demonstrate fluids viscosity measurements and vibration detection as examples of possible applications