Comparison of 3D classical and quantum mechanical He scattering
... respectively. The impact parameters are in the interval [0,1]. a and b are lattice constants. vxi , vyi and vzi are the initial velocities in the direction x, y and z, respectively. E is the average energy of the incident He particle. Trajectories are calculated until z P zmax becomes valid. The cru ...
... respectively. The impact parameters are in the interval [0,1]. a and b are lattice constants. vxi , vyi and vzi are the initial velocities in the direction x, y and z, respectively. E is the average energy of the incident He particle. Trajectories are calculated until z P zmax becomes valid. The cru ...
Quantum Random Walk via Classical Random Walk With Internal
... to some probabilistic rule is studied. In the simplest model, a particle will move, at every discrete time step, one unit to the left or to the right with probabilities p and 1 − p, respectively, independent of its past positions. Many useful questions can be asked about the dynamics of the particle ...
... to some probabilistic rule is studied. In the simplest model, a particle will move, at every discrete time step, one unit to the left or to the right with probabilities p and 1 − p, respectively, independent of its past positions. Many useful questions can be asked about the dynamics of the particle ...
Anderson transition ???????? Critical Statistics
... are universally described by random matrix theory. With the help of the one parameter scaling theory we propose an alternative characterization of this universality class. It is also identified the universality class associated to the metal-insulator transition. In low dimensions it is characterized ...
... are universally described by random matrix theory. With the help of the one parameter scaling theory we propose an alternative characterization of this universality class. It is also identified the universality class associated to the metal-insulator transition. In low dimensions it is characterized ...
Wireless Networking & Security
... unsecured network. Allows log in as user for sites like Facebook and Twitter. ...
... unsecured network. Allows log in as user for sites like Facebook and Twitter. ...
14-06-16_PLCQC - Columbia University
... Adiabatic Quantum Computing • Quantum computations can be implemented by the adiabatic evolution of the Hamiltonian of a quantum system • To solve a given problem we initialize the system to the ground state of a simple Hamiltonian • We then evolve the Hamiltonian to one whose ground state encodes ...
... Adiabatic Quantum Computing • Quantum computations can be implemented by the adiabatic evolution of the Hamiltonian of a quantum system • To solve a given problem we initialize the system to the ground state of a simple Hamiltonian • We then evolve the Hamiltonian to one whose ground state encodes ...
Orders / Phases of matter
... -local unitary transformations be connected via local unitary transf. lead to product states (what kind of product states?) -all states with short-range entanglement belong to the same phase -symmetry protected topological order / phases belong to this class -examples are 1.) Haldane phase (spin-1-c ...
... -local unitary transformations be connected via local unitary transf. lead to product states (what kind of product states?) -all states with short-range entanglement belong to the same phase -symmetry protected topological order / phases belong to this class -examples are 1.) Haldane phase (spin-1-c ...
An Introduction to Quantum Fluid of Light
... In a second part, we will show an eloquent result of their experiment highlighting the superfluidy of polaritons. One of the group perspective is to use an atomic gas as medium to generate a quantum fluid of light, that will constitute our last part. ...
... In a second part, we will show an eloquent result of their experiment highlighting the superfluidy of polaritons. One of the group perspective is to use an atomic gas as medium to generate a quantum fluid of light, that will constitute our last part. ...
On The Computability of Julia Sets
... Introduction to information complexity Mark Braverman Princeton University June 30, 2013 ...
... Introduction to information complexity Mark Braverman Princeton University June 30, 2013 ...
Another Philosopher Looks at Quantum Mechanics - SAS
... satisfactory interpretation of quantum mechanics exists today’ (1965, 157). The time scale is amazing. Putnam’s important piece was written forty years after the first formulations and successes of quantum mechanics. I am writing forty years later and about a theory that has transformed our technolo ...
... satisfactory interpretation of quantum mechanics exists today’ (1965, 157). The time scale is amazing. Putnam’s important piece was written forty years after the first formulations and successes of quantum mechanics. I am writing forty years later and about a theory that has transformed our technolo ...
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.