Noisy Storage talk
... Typically, cryptographic players use credentials such as secret information authenticated information biometric features can the geographical location used as (only) credential? examples of desirable primitives: position-based secret communication (e.g. between military bases) position-bas ...
... Typically, cryptographic players use credentials such as secret information authenticated information biometric features can the geographical location used as (only) credential? examples of desirable primitives: position-based secret communication (e.g. between military bases) position-bas ...
Quantum Speed-ups for Gibbs Sampling
... thm There is a quantum algorithm for solving SDPs running in time Õ(n1/2 m1/2 r δ-2 R2) Input: n x n matrices r-sparse C, A1, ..., Am and numbers b1, ..., bm Output: Samples from y/||y||2 and ||y||2 Q. Samples from X/tr(X) and tr(X) Oracle Model: We assume there’s an oracle that outputs a chosen non ...
... thm There is a quantum algorithm for solving SDPs running in time Õ(n1/2 m1/2 r δ-2 R2) Input: n x n matrices r-sparse C, A1, ..., Am and numbers b1, ..., bm Output: Samples from y/||y||2 and ||y||2 Q. Samples from X/tr(X) and tr(X) Oracle Model: We assume there’s an oracle that outputs a chosen non ...
QIPC 2011
... • Looks like large infinity of qubits. • Additional part of Hilbert space: – electron spin --- doubles the number of modes of our Fock space – nuclear spin --- completely separate degrees of freedom, very important in solid state context ...
... • Looks like large infinity of qubits. • Additional part of Hilbert space: – electron spin --- doubles the number of modes of our Fock space – nuclear spin --- completely separate degrees of freedom, very important in solid state context ...
A spectral theoretic approach to quantum
... • In fact, we prove that H is integrable in a stronger sense: it is equivalent (via change of orthonormal basis) to an integrable, canonically quantized, smooth classical ndimensional Hamiltonian over , set into Birkhoff’s normal form. Thus, in this basis we have separation of variables in the sense ...
... • In fact, we prove that H is integrable in a stronger sense: it is equivalent (via change of orthonormal basis) to an integrable, canonically quantized, smooth classical ndimensional Hamiltonian over , set into Birkhoff’s normal form. Thus, in this basis we have separation of variables in the sense ...
generation of arbitrary quantum states from atomic ensembles
... of a collective spin excitation into the F = 2 state, followed by immediate recycling quantum metrology [6], engineering back into F = 3. This results in a correlated pair of signal and idler photons. of CSEs is of fundamental interest (b) Sketch of experimental setup. as it allows one to explore th ...
... of a collective spin excitation into the F = 2 state, followed by immediate recycling quantum metrology [6], engineering back into F = 3. This results in a correlated pair of signal and idler photons. of CSEs is of fundamental interest (b) Sketch of experimental setup. as it allows one to explore th ...
PPT | 299.77 KB - Joint Quantum Institute
... some of it makes its way into the cavity, where it interacts with the quantum dot. It is this interaction which transforms the waveguide’s transmission properties. Previous optical switches have been able to work only by using bulky nonlinear-crystals and high input power. The switch, by contrast, a ...
... some of it makes its way into the cavity, where it interacts with the quantum dot. It is this interaction which transforms the waveguide’s transmission properties. Previous optical switches have been able to work only by using bulky nonlinear-crystals and high input power. The switch, by contrast, a ...
Quantum Entanglement on the Macroscopic Scale
... • Since the state of the nucleus and the cat are coupled, we can describe the entire system quantum mechanically as an entangled state: • However, by our earlier discussion, such a macroscopic state will quickly decohere to a statistical mixed state, meaning the cat is either alive or dead before we ...
... • Since the state of the nucleus and the cat are coupled, we can describe the entire system quantum mechanically as an entangled state: • However, by our earlier discussion, such a macroscopic state will quickly decohere to a statistical mixed state, meaning the cat is either alive or dead before we ...
What`s bad about this habit
... phenomena whose spatial and temporal extension we find it useful or necessary to ignore. The device of spacetime has been so powerful that we often reify that abstract bookkeeping structure, saying that we inhabit a world that is such a four- (or, for some of us, ten-) dimensional continuum. The rei ...
... phenomena whose spatial and temporal extension we find it useful or necessary to ignore. The device of spacetime has been so powerful that we often reify that abstract bookkeeping structure, saying that we inhabit a world that is such a four- (or, for some of us, ten-) dimensional continuum. The rei ...
Quantum computing
Quantum computing studies theoretical computation systems (quantum computers) that make direct use of quantum-mechanical phenomena, such as superposition and entanglement, to perform operations on data. Quantum computers are different from digital computers based on transistors. Whereas digital computers require data to be encoded into binary digits (bits), each of which is always in one of two definite states (0 or 1), quantum computation uses quantum bits (qubits), which can be in superpositions of states. A quantum Turing machine is a theoretical model of such a computer, and is also known as the universal quantum computer. Quantum computers share theoretical similarities with non-deterministic and probabilistic computers. The field of quantum computing was initiated by the work of Yuri Manin in 1980, Richard Feynman in 1982, and David Deutsch in 1985. A quantum computer with spins as quantum bits was also formulated for use as a quantum space–time in 1968.As of 2015, the development of actual quantum computers is still in its infancy, but experiments have been carried out in which quantum computational operations were executed on a very small number of quantum bits. Both practical and theoretical research continues, and many national governments and military agencies are funding quantum computing research in an effort to develop quantum computers for civilian, business, trade, and national security purposes, such as cryptanalysis.Large-scale quantum computers will be able to solve certain problems much more quickly than any classical computers that use even the best currently known algorithms, like integer factorization using Shor's algorithm or the simulation of quantum many-body systems. There exist quantum algorithms, such as Simon's algorithm, that run faster than any possible probabilistic classical algorithm.Given sufficient computational resources, however, a classical computer could be made to simulate any quantum algorithm, as quantum computation does not violate the Church–Turing thesis.