Physical-depth architectural requirements for generating universal photonic cluster states

Most leading proposals for linear-optical quantum computing (LOQC) use cluster states, which act as a universal resource for measurement-based (one-way) quantum computation (MBQC). In ballistic approaches to LOQC, cluster states are generated passively from small entangled resource states using so-called fusion operations. Results from percolation theory have previously been used to argue that universal cluster states can be generated in the ballistic approach using schemes which exceed the critical threshold for percolation, but these results consider cluster states with unbounded size. Here we consider how successful percolation can be maintained using a physical architecture with fixed physical depth, assuming that the cluster state is continuously generated and measured, and therefore that only a finite portion of it is visible at any one point in time. We show that universal LOQC can be implemented using a constant-size device with modest physical depth, and that percolation can be exploited using simple pathfinding strategies without the need for high-complexity algorithms.Comment: 18 pages, 10 figure

Comparing classical and quantum equilibration

By using a physically relevant and theory independent definition of measurement-based equilibration, we show quantitatively that equilibration is easier for quantum systems than for classical systems, in the situation where the initial state of the system is completely known (a pure state). This shows that quantum equilibration is a fundamental aspect of many quantum systems, while classical equilibration relies on experimental ignorance. When the state is not completely known (a mixed state), this framework also shows that quantum equilibration requires weaker conditions

Loss-tolerant teleportation on large stabilizer states

We present a general method for finding loss-tolerant teleportation on large, entangled stabilizer states using only single-qubit measurements, known as \emph{stabilizer pathfinding} (SPF). For heralded loss, SPF is shown to generate optimally loss-tolerant measurement patterns on any given stabilizer state. Furthermore, SPF also provides highly loss-tolerant teleportation strategies when qubit loss is unheralded. We provide a fast algorithm for SPF that updates continuously as a state is generated and measured, which is therefore suitable for real-time implementation on a quantum-computing device. When compared to simulations of previous heuristics for loss-tolerant teleportation on graph states, SPF provides considerable gains in tolerance to both heralded and unheralded loss, achieving a near-perfect teleportation rate ($> 95\%$) in the regime of low qubit loss ($< 10\%$) on various graph state lattices. Using these results we also present evidence that points towards the existence of loss-tolerant thresholds on such states, which in turn indicates that the loss-tolerant behaviour we have found also applies as the number of qubits tends to infinity. Our results represent a significant advance towards the realistic implementation of teleportation in both large-scale and near-future quantum architectures that are susceptible to qubit loss, such as linear optical quantum computation and quantum communication networks.Comment: 29 pages, 12 figures. Quantum Science and Technology (2018

The Frost Multidimensional Perfectionism Scale revisited: More perfect with four (instead of six) dimensions

The Frost Multidimensional Perfectionism Scale (FMPS; Frost, Marten, Lahart & Rosenblate, 1990) provides six subscales for a multidimensional assessment of perfectionism: Concern over Mistakes (CM), Personal Standards (PS), Parental Expectations (PE), Parental Criticism (PC), Doubts about actions (D), and Organization (O). Despite its increasing popularity in personality and clinical research, the FMPS has also drawn some criticism for its factorial instability across samples. The present article argues that this instability may be due to an overextraction of components. Whereas all previous analyses presented six-factor solutions for the FMPS items, a reanalysis with Horn's parallel analysis suggested only four or five underlying factors. To investigate the nature of these factors, item responses from N = 243 participants were subjected to principal component analysis. Again, parallel analysis retained only four components. Varimax rotation replicated PS and O as separate factors, whereas combining CM with D as well as PE with PC. Consequently, the present article suggests a reduction to four (instead of six) FMPS subscales. Differential correlations with anxiety, depression, parental representations and action tendencies underscore the advantage of this solution

Physical appearance perfectionism explains variance in eating disorder symptoms above general perfectionism

Physical appearance perfectionism is a domain-specific form of perfectionism comprising two components: hope for perfection and worry about imperfection (Yang & Stoeber, 2012). Previous studies found that physical appearance perfectionism is related to eating disorder symptoms, particularly the worry about imperfection component, but did not address the question of whether physical appearance perfectionism explains variance in eating disorder symptoms above general perfectionism. The present study investigated the question examining 559 female university students. Physical appearance perfectionism explained an additional 9-17% of variance in eating disorder symptoms above the 11-20% variance explained by general perfectionism. The findings suggest that physical appearance perfectionism plays an important role in disordered eating beyond general perfectionis

The Grizzly, February 28, 2008

Tragedy Strikes at Northern Illinois University • Safety at Ursinus College in Light of the NIU Massacre • Anti-HIV Gel Fails Clinical Trial, Opens Doors • Investigating the Seven-Day Itch • Great Wall vs. China Jade: Local Chinese Dining • Third Annual CoSA Celebration Hits Ursinus in April • Review of SPINTfest at UC • Opinions: NME Scandal: An Outsider\u27s Take; Why Kosovo\u27s Independence Matters • Strong Champs for UC Swim • Gymnastics Prepares for Nationalshttps://digitalcommons.ursinus.edu/grizzlynews/1757/thumbnail.jp

The Grizzly, February 7, 2008

Cafe Owner Advises Mindful Consumerism • More Money in Your Pocket? • Ledger\u27s Death Still Leaves Questions • NY Times Reporter Discusses Climate Issues at Focus the Nation • Arctic Mammals Battle Climate Change • Modern Menstruation Alternatives: The Menstrual Cup • Wismer Student Restaurant Welcomes New Turnstile • Things I Wish I Knew as a Freshman: Local Hot Spots • Satchmo\u27s: A Unique Sub Experience • Bringing Back the High Five • Endorse This!: How Important is a Political Backing? • Women\u27s Basketball Endures Tough Loss to Muleshttps://digitalcommons.ursinus.edu/grizzlynews/1754/thumbnail.jp

The Grizzly, January 31, 2008

What\u27s Your Dirty Little Secret? RLO Posts Free Speech • Focus the Nation Events Begin Today at Ursinus College • Writers Continue to Protest Insufficient Compensation • New Statistics Reveal Decline in U.S. Abortion Rates • New Member Education is Not Your Enemy • UC Gives Tribute to MLK Jr. • Middlesex, by Jeffrey Eugenides • Opinions: Return of Information Society; Honoring Dr. Martin Luther King from Home; John Edwards: Wasting His (And Our) Time • Gymnastics Off to a Strong Start • Shattuck Helps Lead the Bears to Victoryhttps://digitalcommons.ursinus.edu/grizzlynews/1753/thumbnail.jp

The Grizzly, April 3, 2008

Crude Awakening: Ways to Beat Surging Gas Pump Prices • Airband Turns 25 • Herpes Hindrance: Part Two • Literary Food Fest • Lou\u27s Too: The Charming Steak Shop • Fully Loaded EV Performance Attracts Full House • Faculty Spotlight: Dr. Goldsmith • Opinions: Fed Bailout? Fed, Butt Out!; Olympic Controversy • Men\u27s Lax Defeats McDaniel • Women\u27s Lax Shames McDanielhttps://digitalcommons.ursinus.edu/grizzlynews/1760/thumbnail.jp