Quantum coding with finite resources
... this asymptotic characterization is insufficient in practical scenarios where decoherence severely limits our ability to manipulate large quantum systems in the encoder and decoder. In practical settings, we should instead focus on the optimal trade-off between three parameters: the rate of the code, ...
... this asymptotic characterization is insufficient in practical scenarios where decoherence severely limits our ability to manipulate large quantum systems in the encoder and decoder. In practical settings, we should instead focus on the optimal trade-off between three parameters: the rate of the code, ...
... Eq. (2) one finds that A commutes with H and, therefore, if A does not depend on the time, then A is conserved. It should be pointed out that Refs. 8 and 9 also consider the Galilean transformations, which are related to a constant of motion that depends explicitly on the time (see Sec. 3.1, below). ...
QM Consilience_3_
... of magnitudes is what statisticians now refer to as the estimation of the adjustable parameters. Whewell then makes an insightful claim about curve-fitting: If we thus take the whole mass of the facts, and remove the errours of actual observation, by making the curve which expresses the supposed ob ...
... of magnitudes is what statisticians now refer to as the estimation of the adjustable parameters. Whewell then makes an insightful claim about curve-fitting: If we thus take the whole mass of the facts, and remove the errours of actual observation, by making the curve which expresses the supposed ob ...
URL - StealthSkater
... magnetic flux tubes by a phase transition changing Planck constant could be fundamental in biocatalysis since it would allow distant molecules connected by flux tubes to find each other in the molecular crowd. DNA as a topological quantum computer is the idea that I have been developing for 5 years ...
... magnetic flux tubes by a phase transition changing Planck constant could be fundamental in biocatalysis since it would allow distant molecules connected by flux tubes to find each other in the molecular crowd. DNA as a topological quantum computer is the idea that I have been developing for 5 years ...
ANGULAR MOMENTUM IN QUANTUM MECHANICS
... F. Use your knowledge of classical vectors to account for each of the following pieces of information about the particle above: 1. The most likely result of a measurement of Lz is 0. ...
... F. Use your knowledge of classical vectors to account for each of the following pieces of information about the particle above: 1. The most likely result of a measurement of Lz is 0. ...
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... is the wavefunction for a particle with mass m, !h Planck’s constant, U the gravitational potential, E the energy eigenvalue and G the gravitational constant. Because the total energy operator is the generator for time translations, we should in principle also be able to use these equations to descr ...
... is the wavefunction for a particle with mass m, !h Planck’s constant, U the gravitational potential, E the energy eigenvalue and G the gravitational constant. Because the total energy operator is the generator for time translations, we should in principle also be able to use these equations to descr ...
Slide 1
... Ballistic conductance = (e2 / h) g ( EF ) g= number of solutions which run from left to right: g= 0, 1 or 2 For a broad range of parameters, there is only one running solution, and then the electrons are fully polarized! ...
... Ballistic conductance = (e2 / h) g ( EF ) g= number of solutions which run from left to right: g= 0, 1 or 2 For a broad range of parameters, there is only one running solution, and then the electrons are fully polarized! ...
Growth, Optical Properties, and Optimization of Infrared
... High-performance III-V semiconductors based on ternary alloys and superlattice systems are fabricated, studied, and compared for infrared optoelectronic applications. InAsBi is a ternary alloy near the GaSb lattice constant that is not as thoroughly investigated as other III-V alloys and that is cha ...
... High-performance III-V semiconductors based on ternary alloys and superlattice systems are fabricated, studied, and compared for infrared optoelectronic applications. InAsBi is a ternary alloy near the GaSb lattice constant that is not as thoroughly investigated as other III-V alloys and that is cha ...
Towards A Quantum Mechanical Model of Foreign Policy
... The chief philosophical implication of these laws is the principle of cause and effect. This holds that for any natural event, there must have been a direct and identifiable trigger. It is also suggestive that the same cause must be assigned to natural events of the same kind irrespective of distanc ...
... The chief philosophical implication of these laws is the principle of cause and effect. This holds that for any natural event, there must have been a direct and identifiable trigger. It is also suggestive that the same cause must be assigned to natural events of the same kind irrespective of distanc ...
Scanned copy Published in Physical Principles of Neuronal and
... some sense physically representable, for if any alternative were totally impossible then deciding' against it is a vacuous process. But on another level, in so far as the rules or constraints of decision-making are effective, some of these alternatives actually became impossible, or at least improb ...
... some sense physically representable, for if any alternative were totally impossible then deciding' against it is a vacuous process. But on another level, in so far as the rules or constraints of decision-making are effective, some of these alternatives actually became impossible, or at least improb ...
Even-denominator fractional quantum Hall effect in bilayer graphene
... all contact configurations show sharp Dirac peak at same VG ...
... all contact configurations show sharp Dirac peak at same VG ...
Quantum-state purity of heralded single photons produced from
... the heralded photon 1 with a temporal wave form ψ1|2 (τ ) = ψ0 (τ )e−iω10 τ given in Eq. (11). Now let us switch the trigger detection to photon 1 to heralding the presence of photon 2. We obtain the temporal wave function of the heralded photon 2 as ψ2|1 (τ ) = ψ0 (−τ )e−iω20 τ , whose amplitude en ...
... the heralded photon 1 with a temporal wave form ψ1|2 (τ ) = ψ0 (τ )e−iω10 τ given in Eq. (11). Now let us switch the trigger detection to photon 1 to heralding the presence of photon 2. We obtain the temporal wave function of the heralded photon 2 as ψ2|1 (τ ) = ψ0 (−τ )e−iω20 τ , whose amplitude en ...
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.