A New Form of Matter (pdf, 217 kB)
... than particles. Held together by laser beams and magnetic traps, the atoms overlapped and formed a single giant (by atomic standards) matter wave. Says Ketterle: "Pictures of BECs can be regarded as photographs of wave functions" -- that is, solutions to Schrodinger's equation. Working independently ...
... than particles. Held together by laser beams and magnetic traps, the atoms overlapped and formed a single giant (by atomic standards) matter wave. Says Ketterle: "Pictures of BECs can be regarded as photographs of wave functions" -- that is, solutions to Schrodinger's equation. Working independently ...
Pauline Oliveros and Quantum Sound
... musical talents—the accordion. “Little did I realize in 1942 that my fascination with the accordion at age nine would continue to this day and that I would re-tune and use the accordion with recording and electronics as I do now” (“Tripping” 2). She majored in the instrument in college, but her deve ...
... musical talents—the accordion. “Little did I realize in 1942 that my fascination with the accordion at age nine would continue to this day and that I would re-tune and use the accordion with recording and electronics as I do now” (“Tripping” 2). She majored in the instrument in college, but her deve ...
Quantum effects in biology
... zero-point energy that gives a quantum correction to the classical activation free energy and the H-tunneling effects [34,37,38]. Such nuclear quantum effects represent another class of quantum phenomena in biological systems. Nuclear quantum effects in enzymes have been studied via measurements of ...
... zero-point energy that gives a quantum correction to the classical activation free energy and the H-tunneling effects [34,37,38]. Such nuclear quantum effects represent another class of quantum phenomena in biological systems. Nuclear quantum effects in enzymes have been studied via measurements of ...
Population inversion in optically pumped asymmetric quantum well
... subband separation below E LO does not eliminate LO phonon scattering unless both the lattice and electron temperatures are very low. This observation concurs with several experimental reports in which the measured intersubband lifetimes ~for subband separations less than E LO! were found to be much ...
... subband separation below E LO does not eliminate LO phonon scattering unless both the lattice and electron temperatures are very low. This observation concurs with several experimental reports in which the measured intersubband lifetimes ~for subband separations less than E LO! were found to be much ...
by Chao Shen - Deep Blue
... APPENDIX E: Proof of Inverse Matrix Formula . . . . . . . . . . . . . . . . . . . . . 93 ...
... APPENDIX E: Proof of Inverse Matrix Formula . . . . . . . . . . . . . . . . . . . . . 93 ...
IST Austria Newsletter
... Existence of a new quasiparticle demonstrated How do molecules rotate in a solvent? Answering this question is a complicated task as the molecular rotation is perturbed by the surrounding atoms. Large-scale computer simulations have long been the main approach to model molecule-solvent interactions. ...
... Existence of a new quasiparticle demonstrated How do molecules rotate in a solvent? Answering this question is a complicated task as the molecular rotation is perturbed by the surrounding atoms. Large-scale computer simulations have long been the main approach to model molecule-solvent interactions. ...
Mixed, pure, and entangled quantum states. Density matrix
... Quantum Information and Quantum Optics course, 2013 ...
... Quantum Information and Quantum Optics course, 2013 ...
Copenhagen interpretation From Wikipedia, the free encyclopedia
... theoretical formulations that constitute quantum physics to the experience that all of us share in the world of everyday life fell first to Niels Bohr and Werner Heisenberg in the course of their collaboration in Copenhagen around 1927. Bohr and Heisenberg had stepped beyond the world of empirical e ...
... theoretical formulations that constitute quantum physics to the experience that all of us share in the world of everyday life fell first to Niels Bohr and Werner Heisenberg in the course of their collaboration in Copenhagen around 1927. Bohr and Heisenberg had stepped beyond the world of empirical e ...
Entangled Simultaneous Measurement and Elementary Particle Representations
... the desired system expectation values. The theory of entangled simultaneous quantum measurement was extended to non-relativistic spin by coupling to spin-1/2 meters by Levine and Tucci [12]. In this case measurements project the system to Bloch states corresponding to the measured spin components. ...
... the desired system expectation values. The theory of entangled simultaneous quantum measurement was extended to non-relativistic spin by coupling to spin-1/2 meters by Levine and Tucci [12]. In this case measurements project the system to Bloch states corresponding to the measured spin components. ...
On the Theory of Intramolecular Energy Transfer
... corresponding semiclassical trajectory (i.e. the one whose actions match the quantum numbers via a semiclassical relation). 1 They display regular (rather than chaotic) contour patterns. Indeed, semiclassically calculated wavefunctions are expected to compare well with the quantum-mechanical ones, i ...
... corresponding semiclassical trajectory (i.e. the one whose actions match the quantum numbers via a semiclassical relation). 1 They display regular (rather than chaotic) contour patterns. Indeed, semiclassically calculated wavefunctions are expected to compare well with the quantum-mechanical ones, i ...
- D-Wave Systems
... Quantum annealing (QA) systems such as those developed by D-Wave Systems will provide one path beyond the anticipated end of Moore’s Law performance improvements for classical computers. However, the programming model implemented by QA is very different from that of the classical von Neumann archite ...
... Quantum annealing (QA) systems such as those developed by D-Wave Systems will provide one path beyond the anticipated end of Moore’s Law performance improvements for classical computers. However, the programming model implemented by QA is very different from that of the classical von Neumann archite ...
An Atomic Source of Quantum Light - Institute for Quantum Science
... noise to the seed beam. Here each trace represents a different two photon detuning from the Raman transition between ground states δ2 ≡ ω − ωHF . The peak value of each trace corresponds to the chosen value of δ2 . (b) At high optical powers, the fiber coupled Ti:Sa light acquired significant techni ...
... noise to the seed beam. Here each trace represents a different two photon detuning from the Raman transition between ground states δ2 ≡ ω − ωHF . The peak value of each trace corresponds to the chosen value of δ2 . (b) At high optical powers, the fiber coupled Ti:Sa light acquired significant techni ...
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.