arXiv:hep-th/0006105v1 15 Jun 2000 Quotient Construction of `t
... prediction about physical phenomenon is then shown to be a derived concept. In ’t Hooft’s opinion, at the atomic scale quantum states are equivalence classes of primordial states at the Planck scale. If we only care the temporal evolution of equivalence classes, the information within each equivalen ...
... prediction about physical phenomenon is then shown to be a derived concept. In ’t Hooft’s opinion, at the atomic scale quantum states are equivalence classes of primordial states at the Planck scale. If we only care the temporal evolution of equivalence classes, the information within each equivalen ...
Quantum Behavior of Measurement Apparatus - HAL-ENS
... The measurement apparatus plays an important role not only in quantum physics experiments, by providing information about the measured system, but also in the foundations of quantum theory by leading to the famous measurement problem [1, 2]. This one is in part linked to our ability to prepare the m ...
... The measurement apparatus plays an important role not only in quantum physics experiments, by providing information about the measured system, but also in the foundations of quantum theory by leading to the famous measurement problem [1, 2]. This one is in part linked to our ability to prepare the m ...
OAM-correlated pair transmission
... context of a camera-enabled ghost imaging system (see figure 1). We compare our Klyshko advanced wave picture images with those obtained using coincidence measurements and demonstrate the equivalence between the spatial distributions in both sets of data (see figure 2). This equivalence suggests tha ...
... context of a camera-enabled ghost imaging system (see figure 1). We compare our Klyshko advanced wave picture images with those obtained using coincidence measurements and demonstrate the equivalence between the spatial distributions in both sets of data (see figure 2). This equivalence suggests tha ...
Quantum tunneling and stochastic resonance - Physik Uni
... in Josephson systems where both classical SR @19# and quantum corrections @17,20,21# have been observed, it can be in the mK region. The role of quantum fluctuations on SR has only started to be explored. As a matter of fact, the quantum tunneling mechanism for the escape rate, and hence for SR itse ...
... in Josephson systems where both classical SR @19# and quantum corrections @17,20,21# have been observed, it can be in the mK region. The role of quantum fluctuations on SR has only started to be explored. As a matter of fact, the quantum tunneling mechanism for the escape rate, and hence for SR itse ...
Matthew Hastings
... • Find the ground state of a ferromagnetic Ising model of N spins with arbitrary, position-dependent magnetic field ...
... • Find the ground state of a ferromagnetic Ising model of N spins with arbitrary, position-dependent magnetic field ...
Parallel Universes
... 1.This type of parallel universes is sort of a catch-all for other mathematical structures which we can conceive of, but which we don't observe as physical realities in our universe. 2.The Level 4 parallel universes are ones which are governed by different equations from those that govern our univer ...
... 1.This type of parallel universes is sort of a catch-all for other mathematical structures which we can conceive of, but which we don't observe as physical realities in our universe. 2.The Level 4 parallel universes are ones which are governed by different equations from those that govern our univer ...
Uncertainty Relations for Quantum Mechanical Observables
... To gain a solid uncertainty, we specify the experiment and especially the measuring process more: Let ψ, ξ be two states (representing particles). We first want to measure A on ψ. We assume that every meaurement includes interaction with another particle (cf. measurement of car speed with radar gun) ...
... To gain a solid uncertainty, we specify the experiment and especially the measuring process more: Let ψ, ξ be two states (representing particles). We first want to measure A on ψ. We assume that every meaurement includes interaction with another particle (cf. measurement of car speed with radar gun) ...
Superconducting Circuits and Quantum Computation
... Evan Moran Here we use superconducting circuits as components for quantum computing and as model systems for non-linear dynamics. Quantum computation holds the potential to solve problems currently intractable with today’s computers. Information in a quantum computer is stored on quantum variables, ...
... Evan Moran Here we use superconducting circuits as components for quantum computing and as model systems for non-linear dynamics. Quantum computation holds the potential to solve problems currently intractable with today’s computers. Information in a quantum computer is stored on quantum variables, ...
variations in variation and selection: the ubiquity
... uncertainty principles1 (so that the uncertainty relationships act as selections on what vacuum activity can proceed), so also do the irreversibility conditions (whatever they may be) irreversibly select conditions of underlying reversible processes. These selections of states from which further vac ...
... uncertainty principles1 (so that the uncertainty relationships act as selections on what vacuum activity can proceed), so also do the irreversibility conditions (whatever they may be) irreversibly select conditions of underlying reversible processes. These selections of states from which further vac ...
Neural Network Algorithms-Quantum-Glia
... For precision, performance, and usability What better place to turn for help, than back to our original inspiration? In green are my personal speculations ...
... For precision, performance, and usability What better place to turn for help, than back to our original inspiration? In green are my personal speculations ...
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.