34,080 research outputs found
LOOC UP: Locating and observing optical counterparts to gravitational wave bursts
Gravitational wave (GW) bursts (short duration signals) are expected to be
associated with highly energetic astrophysical processes. With such high
energies present, it is likely these astrophysical events will have signatures
in the EM spectrum as well as in gravitational radiation. We have initiated a
program, "Locating and Observing Optical Counterparts to Unmodeled Pulses in
Gravitational Waves" (LOOC UP) to promptly search for counterparts to GW burst
candidates. The proposed method analyzes near real-time data from the
LIGO-Virgo network, and then uses a telescope network to seek optical-transient
counterparts to candidate GW signals. We carried out a pilot study using
S5/VSR1 data from the LIGO-Virgo network to develop methods and software tools
for such a search. We will present the method, with an emphasis on the
potential for such a search to be carried out during the next science run of
LIGO and Virgo, expected to begin in 2009.Comment: 11 pages, 2 figures; v2) added acknowledgments, additional
references, and minor text changes v3) added 1 figure, additional references,
and minor text changes. v4) Updated references and acknowledgments. To be
published in the GWDAW 12 Conf. Proc. by Classical and Quantum Gravit
Status and Future Perspectives for Lattice Gauge Theory Calculations to the Exascale and Beyond
In this and a set of companion whitepapers, the USQCD Collaboration lays out
a program of science and computing for lattice gauge theory. These whitepapers
describe how calculation using lattice QCD (and other gauge theories) can aid
the interpretation of ongoing and upcoming experiments in particle and nuclear
physics, as well as inspire new ones.Comment: 44 pages. 1 of USQCD whitepapers
Accelerated Randomized Benchmarking
Quantum information processing offers promising advances for a wide range of
fields and applications, provided that we can efficiently assess the
performance of the control applied in candidate systems. That is, we must be
able to determine whether we have implemented a desired gate, and refine
accordingly. Randomized benchmarking reduces the difficulty of this task by
exploiting symmetries in quantum operations.
Here, we bound the resources required for benchmarking and show that, with
prior information, we can achieve several orders of magnitude better accuracy
than in traditional approaches to benchmarking. Moreover, by building on
state-of-the-art classical algorithms, we reach these accuracies with
near-optimal resources. Our approach requires an order of magnitude less data
to achieve the same accuracies and to provide online estimates of the errors in
the reported fidelities. We also show that our approach is useful for physical
devices by comparing to simulations.
Our results thus enable the application of randomized benchmarking in new
regimes, and dramatically reduce the experimental effort required to assess
control fidelities in quantum systems. Finally, our work is based on
open-source scientific libraries, and can readily be applied in systems of
interest.Comment: 10 pages, full source code at
https://github.com/cgranade/accelerated-randomized-benchmarking #quantuminfo
#benchmarkin
- …