When quantum tomography goes wrong: drift of quantum sources and other errors

When quantum tomography goes wrong: drift of quantum sources and other errors

The principle behind quantum tomography is that a large set of observations—many samples from a ‘quorum’ of distinct observables—can all be explained satisfactorily as measurements on a single underlying quantum state or process. Unfortunately, this principle may not hold. When it fails, any standard tomographic estimate should be viewed skeptically. Here we propose a simple way to test for thi...

Quantum computation with phase drift errors

César Miquel1,2,3∗, Juan Pablo Paz † and Wojciech Hubert Zurek 1,3‡ Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106–4030, USA Departamento de F́ısica “J.J. Giambiagi”, FCEN, UBA, Pabellón 1, Ciudad Universitaria, 1428 Buenos Aires, Argentina Theoretical Astrophysics, MSB288, Los Alamos National Laboratory, Los Alamos, NM 87545, USA Instituto de Astronomı́a y F́...

NetReview: Detecting When Interdomain Routing Goes Wrong

Despite many attempts to fix it, the Internet’s interdomain routing system remains vulnerable to configuration errors, buggy software, flaky equipment, protocol oscillation, and intentional attacks. Unlike most existing solutions that prevent specific routing problems, our approach is to detect problems automatically and to identify the offending party. Fault detection is effective for a larger...

When the Fight against Fungi Goes Wrong

When the Swiss clock goes wrong

A Swiss clock and entry into mitosis have something in common: both must be very precise. When the Swiss clock goes wrong, the consequence is the loss of reputation. When entry into mitosis goes wrong, cells may divide in an aberrant way. More generally, cell division events are tightly regulated at the temporal and spatial levels. We have recently shown that in C. elegans, misregulation of the...