Slide 1
... Measurement plays a central role in quantum mechanics. Precision of measurement is restricted not only by technology but also by the theory itself. Heisenberg-limited metrology and weak measurements are the two notions that find use in enhancing sensitivity of measurements. The first can increas ...
... Measurement plays a central role in quantum mechanics. Precision of measurement is restricted not only by technology but also by the theory itself. Heisenberg-limited metrology and weak measurements are the two notions that find use in enhancing sensitivity of measurements. The first can increas ...
Fulltext
... The very notion of locality breaks down at the Planck scale. There is a fundamental length scale of the order of the Planck length (ℓp ∼ 10−35 m) that cannot be probed in a finite time. This reflects the fact that the spacetime manifold has a noncommutative, foamy structure at the very high energy l ...
... The very notion of locality breaks down at the Planck scale. There is a fundamental length scale of the order of the Planck length (ℓp ∼ 10−35 m) that cannot be probed in a finite time. This reflects the fact that the spacetime manifold has a noncommutative, foamy structure at the very high energy l ...
Quantum heat engine with multilevel quantum systems
... A usual heat engine operates between two heat baths, the temperature difference between which completely determines the maximum efficiency of the heat engine. Correspondingly, it is inferred that no power can be extracted if the two baths have the same temperature. But things become different when w ...
... A usual heat engine operates between two heat baths, the temperature difference between which completely determines the maximum efficiency of the heat engine. Correspondingly, it is inferred that no power can be extracted if the two baths have the same temperature. But things become different when w ...
Earth-Moon Lagrangian points as a testbed for general relativity and
... We first analyse the restricted four-body problem consisting of the Earth, the Moon and the Sun as the primaries and a spacecraft as the planetoid. This scheme allows us to take into account the solar perturbation in the description of the motion of a spacecraft in the vicinity of the stable Earth-M ...
... We first analyse the restricted four-body problem consisting of the Earth, the Moon and the Sun as the primaries and a spacecraft as the planetoid. This scheme allows us to take into account the solar perturbation in the description of the motion of a spacecraft in the vicinity of the stable Earth-M ...
Creation and manipulation of entanglement in spin chains far from
... entanglement creation and manipulation is a fundamental requirement. One way to achieve this is by using time dependent fields. The benefits of external ac-driving has been recently reported in Refs. [1,13–18]. However, from a technological point of view, it appears rather difficult to access each spin ...
... entanglement creation and manipulation is a fundamental requirement. One way to achieve this is by using time dependent fields. The benefits of external ac-driving has been recently reported in Refs. [1,13–18]. However, from a technological point of view, it appears rather difficult to access each spin ...
The Quantum World
... view of the natural world. One is Einstein's theory of special relativity; the other is quantum mechanics. There is no doubt in my mind that quantum mechanics is much the more revolutionary of the two. Although Einstein profoundly changed our understanding of the nature of time and the meaning of si ...
... view of the natural world. One is Einstein's theory of special relativity; the other is quantum mechanics. There is no doubt in my mind that quantum mechanics is much the more revolutionary of the two. Although Einstein profoundly changed our understanding of the nature of time and the meaning of si ...
Braunstein
... Computational complexity: how the `time’ to complete an algorithm scales with the size of the input. ...
... Computational complexity: how the `time’ to complete an algorithm scales with the size of the input. ...
Black-Body Radiation for Twist-Deformed Space
... as perform its numerical integration to the θ-deformed total radiation energy. In such a way we indicate that the space-time noncommutativity very strongly damps the black-body radiation process. Besides we provide for small parameter θ the twisted counterparts of the Rayleigh-Jeans and Wien distrib ...
... as perform its numerical integration to the θ-deformed total radiation energy. In such a way we indicate that the space-time noncommutativity very strongly damps the black-body radiation process. Besides we provide for small parameter θ the twisted counterparts of the Rayleigh-Jeans and Wien distrib ...
Studies in Composing Hydrogen Atom Wavefunctions
... Thus, the spatial distribution of an eigenfunction’s magnitude does not change with time. Additionally, two different eigenfunctions can share the same characteristic frequency. An eigenfunction is analogous to a normal mode in a pipe, while a characteristic frequency is analogous to a pure tone. Ei ...
... Thus, the spatial distribution of an eigenfunction’s magnitude does not change with time. Additionally, two different eigenfunctions can share the same characteristic frequency. An eigenfunction is analogous to a normal mode in a pipe, while a characteristic frequency is analogous to a pure tone. Ei ...
Ultimate Intelligence Part I: Physical Completeness and Objectivity
... the input. This entails that it should model even random events, due to Chaitin’s strong definitions of algorithmic randomness [2]. That is to say, the universal mixture can model white noise perfectly (e.g., µ(x0) = µ(x1) = 1/2). More expansive definitions of randomness are not empirically justifia ...
... the input. This entails that it should model even random events, due to Chaitin’s strong definitions of algorithmic randomness [2]. That is to say, the universal mixture can model white noise perfectly (e.g., µ(x0) = µ(x1) = 1/2). More expansive definitions of randomness are not empirically justifia ...
glossery - Paradigm Shift Now
... maximizes its entropy. Prigogine and his advocates feel they have developed a mathematical Theory of Dissipative Structures which is very important to the physical and social sciences; accounting for such phenomena as the Great Red Spot on Jupiter, and perhaps even life itself. Other scientists, inc ...
... maximizes its entropy. Prigogine and his advocates feel they have developed a mathematical Theory of Dissipative Structures which is very important to the physical and social sciences; accounting for such phenomena as the Great Red Spot on Jupiter, and perhaps even life itself. Other scientists, inc ...
Quantum key distribution
Quantum key distribution (QKD) uses quantum mechanics to guarantee secure communication. It enables two parties to produce a shared random secret key known only to them, which can then be used to encrypt and decrypt messages. It is often incorrectly called quantum cryptography, as it is the most well known example of the group of quantum cryptographic tasks.An important and unique property of quantum key distribution is the ability of the two communicating users to detect the presence of any third party trying to gain knowledge of the key. This results from a fundamental aspect of quantum mechanics: the process of measuring a quantum system in general disturbs the system. A third party trying to eavesdrop on the key must in some way measure it, thus introducing detectable anomalies. By using quantum superpositions or quantum entanglement and transmitting information in quantum states, a communication system can be implemented which detects eavesdropping. If the level of eavesdropping is below a certain threshold, a key can be produced that is guaranteed to be secure (i.e. the eavesdropper has no information about it), otherwise no secure key is possible and communication is aborted.The security of encryption that uses quantum key distribution relies on the foundations of quantum mechanics, in contrast to traditional public key cryptography which relies on the computational difficulty of certain mathematical functions, and cannot provide any indication of eavesdropping at any point in the communication process, or any mathematical proof as to the actual complexity of reversing the one-way functions used. QKD has provable security based on information theory, and forward secrecy.Quantum key distribution is only used to produce and distribute a key, not to transmit any message data. This key can then be used with any chosen encryption algorithm to encrypt (and decrypt) a message, which can then be transmitted over a standard communication channel. The algorithm most commonly associated with QKD is the one-time pad, as it is provably secure when used with a secret, random key. In real world situations, it is often also used with encryption using symmetric key algorithms like the Advanced Encryption Standard algorithm. In the case of QKD this comparison is based on the assumption of perfect single-photon sources and detectors, that cannot be easily implemented.