Autonomous Ticking Clocks from Axiomatic Principles

There are many different types of time keeping devices. We use the phrase ticking clock to describe those which -- simply put -- "tick" at approximately regular intervals. Various important results have been derived for ticking clocks, and more are in the pipeline. It is thus important to understand the underlying models on which these results are founded. The aim of this paper is to introduce a new ticking clock model from axiomatic principles that overcomes concerns in the community about the physicality of the assumptions made in previous models. The ticking clock model in [arXiv:1806.00491] achieves high accuracy, yet lacks the autonomy of the less accurate model in [10.1103/PhysRevX.7.031022]. Importantly, the model we introduce here achieves the best of both models: it retains the autonomy of [10.1103/PhysRevX.7.031022] while allowing for the high accuracies of [arXiv:1806.00491]. What is more, [10.1103/PhysRevX.7.031022] is revealed to be a special case of the new ticking clock model.Comment: 14 + 14 page

Ticking clocks in quantum theory

We present a derivation of the structure and dynamics of a ticking clock by showing that for finite systems a single natural principle serves to distinguish what we understand as ticking clocks from time-keeping systems in general. As a result we recover the bipartite structure of such a clock: that the information about ticks is a classical degree of freedom. We describe the most general form of the dynamics of such a clock, and discuss the additional simplifications to go from a general ticking clock to models encountered in literature. The resultant framework encompasses various recent research results despite their apparent differences. Finally, we introduce the information theory of ticking clocks, distinguishing their abstract information content and the actually accessible information.Comment: 16 pages + 3 pages appendix, 4 figure

The clock is ticking

This case mainly on talent management and training issues, presents an opportunity for post graduate and undergraduate students to test their knowledge on a real life situation. It provides critical information on the organization’s internal and external environment and highlight issues that require students’ immediate attention. This case has a moderate level of difficulty and may be used in the relevant management classes such as Human Resources and Organizational Behavior

Deal or No Deal: The clock is ticking

Last night’s vote on the first reading of the UK Government’s Internal Market Bill was notable in that it comfortably passed a vote in the House of Commons, despite the media frenzy on the prospect of a Tory backbench rebellion. In the end, 30-odd Tory MPs(including former Chancellor of the Exchequer Sajid Javid) abstained and two (Sir Roget Gale and Andrew Percy) voted against

2017 Football Season Ticket Renewals are Going Strong

2017 Football Season Ticket Renewals are Going Strong With a little over two weeks until renewals end, the clock is ticking to renew season ticket

The clock is ticking : temporally prioritizing eradications on islands

Funding Funding was awarded to Z.T.C. by the New Zealand Government through a New Zealand International Doctoral Research Scholarship. Funding was awarded to T.W.B. by the European Union's Horizon 2020 research and innovation programme Marie Skłodowska Curie Fellowship (Grant No. 747120). Funding was awarded to J.C.R. by the Royal Society of New Zealand Rutherford Discovery Fellowship (Grant No. RDF-UOA1404) and the BioHeritage National Science Challenge (Grant No. 1617-44-003). Additional supporting information may be found in the supplementary material of this article. The associated code and dataset are archived and are publicly available at the University of Auckland figshare database (https://doi.org/10.17608/k6.auckland.13542203.v1) and at GitHub (https://github.com/carterz2/temporal‐island‐prioritization).Peer reviewedPostprin

Quantum methods for clock synchronization: Beating the standard quantum limit without entanglement

We introduce methods for clock synchronization that make use of the adiabatic exchange of nondegenerate two-level quantum systems: ticking qubits. Schemes involving the exchange of N independent qubits with frequency $\omega$ give a synchronization accuracy that scales as $(\omega\sqrt{N})^{-1}$, i.e., as the standard quantum limit. We introduce a protocol that makes use of N coherent exchanges of a single qubit at frequency $\omega$, leading to an accuracy that scales as $(\omega N)^{-1}\log N$. This protocol beats the standard quantum limit without the use of entanglement, and we argue that this scaling is the fundamental limit for clock synchronization allowed by quantum mechanics. We analyse the performance of these protocols when used with a lossy channel.Comment: 9 pages, 1 figure, published versio

Illusory perceptions of space and time preserve cross-saccadic perceptual continuity

When voluntary saccadic eye movements are made to a silently ticking clock, observers sometimes think that the second hand takes longer than normal to move to its next position. For a short period, the clock appears to have stopped (chronostasis). Here we show that the illusion occurs because the brain extends the percept of the saccadic target backwards in time to just before the onset of the saccade. This occurs every time we move the eyes but it is only perceived when an external time reference alerts us to the phenomenon. The illusion does not seem to depend on the shift of spatial attention that accompanies the saccade. However, if the target is moved unpredictably during the saccade, breaking perception of the target's spatial continuity, then the illusion disappears. We suggest that temporal extension of the target's percept is one of the mechanisms that 'fill in' the perceptual 'gap' during saccadic suppression. The effect is critically linked to perceptual mechanisms that identify a target's spatial stability

Post-Brexit transfers of personal data: the clock is ticking

The UK government would like to keep EU-UK data transfers largely the same following the country’s separation from the EU, writes J Scott Marcus (Bruegel). But talks have yet to even commence on a future data-sharing relationship, and a landmark European Court of Human Rights ruling in September bodes poorly for the UK’s future status under the EU’s General Data Protection Regulation