A measurement-based quantum computer could consist of a local-gapped Hamiltonian system, whose thermal states-at sufficiently low temperature-are universal resources for the computation. Initialization of the computer would correspond to cooling the system. We perform an experimental quantum simulation of such a cooling process with entangled photons. We prepare three-qubit thermal cluster states exploiting the equivalence between local dephasing and thermalization for these states. This allows us to tune the system's temperature by changing the dephasing strength. We monitor the entanglement as the system cools down and observe the transitions from separability to bound entanglement, and then to free entanglement. We also analyze the performance of the system for measurement-based single-qubit state preparation. These studies constitute a basic characterization of experimental cluster-state computation under imperfect conditions.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.112.160501 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The Unusual Mesophases and Properties Exhibited by a Family of Glycosteroids.
Chemistry
January 2025
Universite Claude Bernard Lyon 1, ICBMS, Bâtiment Lederer, 1 Rue Victor Grignard, F-69622, Villeurbanne, FRANCE.
In this article we describe research on the synthesis and characterization of a family of "Janus" amphiphiles composed of disaccharide head groups and alkaloid units joined together via a methylene linker, and bearing a lateral aliphatic chain of varying length. The condensed phases formed by self-organization of the products as a function of temperature were characterized by differential scanning calorimetry, thermal polarized light microscopy, and small angle X-ray scattering, allied with computational modelling and simulations. Structural studies on heating specimens from the solid showed that some homologues exhibited lamellar, columnar and bicontinuous mesophases, whereas the same homologues revealed different phase sequences on cooling from the amorphous liquid.
View Article and Find Full Text PDFVehicle-induced air pollutant dispersion and personal exposure in an urban street canyon: Association with air-source heat pump outdoor units combined with building envelope components.
Sci Total Environ
January 2025
School of Architecture, Southeast University, 2 Sipailou, Nanjing 210096, China.
Air-source heat pumps are popular in buildings to provide cooling and heating. However, how the air discharged by air-source heat pump outdoor units affects the dispersion of air pollutants in urban street canyons remains poorly understood. This study used coupled simulations to examine the effects that air-source heat pump outdoor units had on vehicle-induced indoor and outdoor air pollution in an urban street canyon and how these effects varied based on the arrangement of outdoor units or the presence of building envelope components (e.
View Article and Find Full Text PDFANFIS-PSO analysis on axisymmetric tetra hybrid nanofluid flow of Cu-CNT-Graphene-Tio with WEG-Blood under linear thermal radiation and inclined magnetic field: A bio-medicine application.
Heliyon
January 2025
Department of Mechanical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran.
Background: The development of heat transfer devices used for heat conversion and recovery in several industrial and residential applications has long focused on improving heat transfer between two parallel plates. Numerous articles have examined the relevance of enhancing thermal performance for the system's performance and economics. Heat transport is improved by increasing the Reynolds number as the turbulent effects grow.
View Article and Find Full Text PDFLong-lasting and controlled-release borate as a biocide against microbial breeding in a recirculating cooling water system.
Sci Total Environ
January 2025
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, China.
Based on the potential bactericidal properties of borate, we synthesized controlled-release borate (CRB) as a novel biocide to inhibit microbial proliferation in a recirculating cooling water system (RCS). In this study, toxicity experiments of CRB were conducted on the dominant bacteria and algae isolated from an actual RCS. The effects of CRB on biocidal performance and genotoxicity were evaluated in a simulated RCS.
View Article and Find Full Text PDFPhotoabsorption of silver cluster cations in an ion trap: nonlinear action spectra multi-photon dissociation directly measured linear absorption spectra.
Nanoscale
January 2025
Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
We report photodissociation processes and spectral measurements upon photoabsorption of size-selected cationic silver clusters, Ag, stored in an ion trap. The experiment shows that small clusters ( ≲ 15) dissociate upon one-photon absorption, whereas larger ones require multiple photons up to five in the present study. The emergence of multi-photon processes is attributed to collisional cooling in the presence of a buffer helium gas in the trap, which competes with size-dependent dissociation rates.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!