Search results for "Coherence theory"
showing 7 items of 17 documents
Observation of time-invariant coherence in a nuclear magnetic resonance quantum simulator
2016
The ability to live in coherent superpositions is a signature trait of quantum systems and constitutes an irreplaceable resource for quantum-enhanced technologies. However, decoherence effects usually destroy quantum superpositions. It was recently predicted that, in a composite quantum system exposed to dephasing noise, quantum coherence in a transversal reference basis can stay protected for an indefinite time. This can occur for a class of quantum states independently of the measure used to quantify coherence, and it requires no control on the system during the dynamics. Here, such an invariant coherence phenomenon is observed experimentally in two different setups based on nuclear magne…
Real-time optical spectrum analyzers operating with spectrally incoherent broadband continuous-wave light source
2007
On the framework of coherence theory we discuss the averaged temporal intensity output provided by real-time optical Fourier transformers when the spectral line shape of the stationary source is considered. Some numerical examples are given and the deviations from perfectly monochromatic sources are pointed out.
Pulse-by-pulse method to characterize partially coherent pulse propagation in instantaneous nonlinear media.
2010
We propose a numerical method for analyzing extensively the evolution of the coherence functions of nonstationary optical pulses in dispersive, instantaneous nonlinear Kerr media. Our approach deals with the individual propagation of samples from a properly selected ensemble that reproduces the coherence properties of the input pulsed light. In contrast to the usual strategy assuming Gaussian statistics, our numerical algorithm allows us to model the propagation of arbitrary partially coherent pulses in media with strong and instantaneous nonlinearities.
Axial resonance of periodic patterns by using a Fresnel biprism.
2013
This paper proposes a method for the generation of high-contrast localized sinusoidal fringes with spatially noncoherent illumination and relatively high light throughput. The method, somehow similar to the classical Lau effect, is based on the use of a Fresnel biprism. It has some advantages over previous methods for the noncoherent production of interference fringes. One is the flexibility of the method, which allows the control of the fringe period by means of a simple axial shift of the biprism. Second is the rapid axial fall-off in visibility around the high-contrast fringe planes. And third is the possibility of creating fringes with increasing or with constant period as the light bea…
Truth, Negation and Meaning
2013
‘True’ and ‘False’ are defined through a linguistic rule requiring the negation operator. This is the elaboration of an idea proffered for the first time by the Stoics on the basis of some remarks by Aristotle and then in modern times by Frege and Wittgenstein. Another thesis of this essay is the following: the true/false rule is a sort of UR-Regel underlying all linguistic practices (including prayers and commands) and all human cultures. Reinterpreting the notion of Spielraum put forward by Wittgenstein in 4.463 of the Tractatus, I will present an implicational pragmatic theory of a true proposition. Jokes and reductio ad absurdum are explained as examples of Spielraum.
Early Confucian Legal Thought: A Theory of Natural Law?
2015
Confucianism has often been compared to natural law, mainly to its non-volunta- ristic currents. However, the possibility to include Confucianism in the group of natural law theories is problematic. Recently, a few scholars, and notably Peerenboom, have challenged the widely shared thesis that Confucius and early Confucian thinkers should be mentioned in the ranks of natural law philosophers. He contends that early Confucian jurisprudence is more profitably compared to Dworkin’s coherence theory of law than to natural law. The present article discusses three core points: the laws of nature and natural law, the connection between law and morality, and the basic epistemological assumptions pr…
Interpretation, Truth and Correspondence
2000
The correspondence theory of truth is usually considered unsuitable for qualitative research. This is because of the interpretive nature of social reality and subjective nature of research procedures. Contra these ideas it is argued that the correspondence theory of truth is presupposed in the practice of qualitative research. This theory does not, however, dictate any methods for verifying the interpretations. Various theories of truth are seen as necessary because of the complexity of the interpretation process.