On Many-Minds Interpretations of Quantum Theory
... particular hitting being seen means. That the word “seen” slips naturally into these questions, suggests that here, as in so many other attempts to understand quantum mechanics, “the observer” has some special role to play. Everett himself said (in DeWitt and Graham 1973, p. 117) that, within the c ...
... particular hitting being seen means. That the word “seen” slips naturally into these questions, suggests that here, as in so many other attempts to understand quantum mechanics, “the observer” has some special role to play. Everett himself said (in DeWitt and Graham 1973, p. 117) that, within the c ...
Transfer Matrices and Excitations with Matrix Product States
... of low lying coincide very precisely with momenta of minima in dispersion ● Values of low lying serve as first approximations to excitation energies and are related to these energies via characteristic velocities ...
... of low lying coincide very precisely with momenta of minima in dispersion ● Values of low lying serve as first approximations to excitation energies and are related to these energies via characteristic velocities ...
Generalized Quantum Measurement
... possess all of the properties required of a density matrix, and indeed: every density matrix can be written (in many ways) as such a product of factors. We can—as has been demonstrated—always arrange for the factors to be square; that done, they are determined only to within “gauge transformations” ...
... possess all of the properties required of a density matrix, and indeed: every density matrix can be written (in many ways) as such a product of factors. We can—as has been demonstrated—always arrange for the factors to be square; that done, they are determined only to within “gauge transformations” ...
Research Statement
... example, it would be interesting to see if Watrous’s celebrated proof of QIP ⊆ PSPACE [46] can be simplified by showing QIP ⊆ PreciseQMA = PSPACE. Further, can we use our result to find the first nontrivial upper-bound for QMA(2), the class of problems verifiable with two unentangled quantum witness ...
... example, it would be interesting to see if Watrous’s celebrated proof of QIP ⊆ PSPACE [46] can be simplified by showing QIP ⊆ PreciseQMA = PSPACE. Further, can we use our result to find the first nontrivial upper-bound for QMA(2), the class of problems verifiable with two unentangled quantum witness ...
Oleg Teryaev
... Newtonian – “Falling elevator” – well known and checked Post-Newtonian – gravity action on SPIN – known since 1962 (Kobzarev and Okun) – not checked on purpose but in fact checked in atomic spins experiments at % level (Silenko,OT’07) Anomalous gravitomagnetic moment iz ZERO or Classical and QUANTUM ...
... Newtonian – “Falling elevator” – well known and checked Post-Newtonian – gravity action on SPIN – known since 1962 (Kobzarev and Okun) – not checked on purpose but in fact checked in atomic spins experiments at % level (Silenko,OT’07) Anomalous gravitomagnetic moment iz ZERO or Classical and QUANTUM ...
Contradiction of Quantum Mechanics with Local Hidden Variables
... substantially smaller violation than obtained in the discrete case (where S ø 1.2) of spin measurements, considered originally by Bell. The choice of Bell inequality and quantum state to give a violation may not be optimal, but nevertheless the possibility of a contradiction of quantum mechanics wit ...
... substantially smaller violation than obtained in the discrete case (where S ø 1.2) of spin measurements, considered originally by Bell. The choice of Bell inequality and quantum state to give a violation may not be optimal, but nevertheless the possibility of a contradiction of quantum mechanics wit ...
Quantum annealing with manufactured spins
... qubit temperature. The key conclusion we draw from Fig. 3b is that our qubit dynamics is best characterized as being quantum mechanical in nature for T=80 mK. The system evolves to its ground state through a process of quantum annealing. But so far we have shown this only for an individual qubit. It ...
... qubit temperature. The key conclusion we draw from Fig. 3b is that our qubit dynamics is best characterized as being quantum mechanical in nature for T=80 mK. The system evolves to its ground state through a process of quantum annealing. But so far we have shown this only for an individual qubit. It ...
The concepts of an atom and chemical bond in physics and chemistry
... of the latter or of chosen approximation. Bader has shown that the essence of the molecular structure of any system of interest (according to unequivocal partitioning of the physical space into regions assign to particular atoms) is contained in scalar field of its total electron density distributio ...
... of the latter or of chosen approximation. Bader has shown that the essence of the molecular structure of any system of interest (according to unequivocal partitioning of the physical space into regions assign to particular atoms) is contained in scalar field of its total electron density distributio ...
Miracles, Materialism, and Quantum Mechanics
... all elements of reality and must be incomplete The Thought Results Conclusion of the EPR paper: Since it has been shown that quantum mechanics cannot predict all elements of reality with certainty, “we are forced to conclude that the quantum-mechanical description of reality given by wave functions ...
... all elements of reality and must be incomplete The Thought Results Conclusion of the EPR paper: Since it has been shown that quantum mechanics cannot predict all elements of reality with certainty, “we are forced to conclude that the quantum-mechanical description of reality given by wave functions ...
Introduction to the general boundary formulation of quantum theory
... Can we reformulate what constitutes a quantum theory such that there is no reference to time locality is manifest what was considered a quantum theory previously is still a quantum theory the increase in “structural baggage” is minimal? YES, using: The mathematical framework of topological quantum f ...
... Can we reformulate what constitutes a quantum theory such that there is no reference to time locality is manifest what was considered a quantum theory previously is still a quantum theory the increase in “structural baggage” is minimal? YES, using: The mathematical framework of topological quantum f ...
On the minimum quantum dimension for a given quantum correlation
... ◦ It works even if the channel and the EPRs are prepared by enemy ◦ Do not have to check the internal working of quantum devices ◦ The base of realistic DI QKD ...
... ◦ It works even if the channel and the EPRs are prepared by enemy ◦ Do not have to check the internal working of quantum devices ◦ The base of realistic DI QKD ...
Vargas
... However each of these geometries can support many nontrivial topologies with finite volumes without altering the dynamics or the curvature. These non-simply connected topologies may equally be any one of the possible quotient manifolds ...
... However each of these geometries can support many nontrivial topologies with finite volumes without altering the dynamics or the curvature. These non-simply connected topologies may equally be any one of the possible quotient manifolds ...
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.