Current State of Quantum Computing
... Government organisations such as USA’s DARPA, the UK’s Defence Evaluation and Research Agency, the Deutsche Forschungsgemeinschaft, and The European Union are spending a lot of money in research as well as the leading players in the information technology and networking industries in order to get cl ...
... Government organisations such as USA’s DARPA, the UK’s Defence Evaluation and Research Agency, the Deutsche Forschungsgemeinschaft, and The European Union are spending a lot of money in research as well as the leading players in the information technology and networking industries in order to get cl ...
Quantum-information transport to multiple receivers
... suffices to find the state adiabatically connected to Alice’s site at t = 0, i.e., 兩⌿共t = 0兲典 = 兩典A. If ⍀B2共t兲 = 0 " t, 兩1典 is adiabatically connected to 兩⌿共t = 0兲典 and the qubit is transferred from 兩典A to 兩典B1. If ⍀B1共t兲 = 0 " t, then 兩2典 is adiabatically connected to 兩典A, and the qubit trans ...
... suffices to find the state adiabatically connected to Alice’s site at t = 0, i.e., 兩⌿共t = 0兲典 = 兩典A. If ⍀B2共t兲 = 0 " t, 兩1典 is adiabatically connected to 兩⌿共t = 0兲典 and the qubit is transferred from 兩典A to 兩典B1. If ⍀B1共t兲 = 0 " t, then 兩2典 is adiabatically connected to 兩典A, and the qubit trans ...
Extremal eigenvalues of local Hamiltonians
... What about the large-scale features, such as the extremal eigenvalues? Do these scale differently for non-interacting or interacting systems? It is generally understood that interacting systems can be frustrated, meaning that all the local terms cannot simultaneously be in their ground state. This s ...
... What about the large-scale features, such as the extremal eigenvalues? Do these scale differently for non-interacting or interacting systems? It is generally understood that interacting systems can be frustrated, meaning that all the local terms cannot simultaneously be in their ground state. This s ...
0 - Department of Computer Science and Engineering, CUHK
... State space for 2 bits: 2; system → |1. - get 1{00, w.p.01, |β|10, all combinations ...
... State space for 2 bits: 2; system → |1. - get 1{00, w.p.01, |β|10, all combinations ...
Experimental Optimal Cloning of Four
... Eq. (1). The cloning fidelity is F ¼ pð’ j ’Þ. The experimental results obtained when cloning all states of the logical basis are reported in Figs. 2(b) and 2(c). The measured values of the fidelity, as well as their average value F I ¼ ð0:708 0:007Þ, are all in good agreement with the theoretica ...
... Eq. (1). The cloning fidelity is F ¼ pð’ j ’Þ. The experimental results obtained when cloning all states of the logical basis are reported in Figs. 2(b) and 2(c). The measured values of the fidelity, as well as their average value F I ¼ ð0:708 0:007Þ, are all in good agreement with the theoretica ...
Private Quantum Channels
... Now let us consider the analogous situation in the quantum world. Alice and Bob are connected by a one-way quantum channel, to which an eavesdropper Eve has complete access. Alice wants to transmit to Bob some n-qubit state taken from some set S , without allowing Eve to obtain any information abo ...
... Now let us consider the analogous situation in the quantum world. Alice and Bob are connected by a one-way quantum channel, to which an eavesdropper Eve has complete access. Alice wants to transmit to Bob some n-qubit state taken from some set S , without allowing Eve to obtain any information abo ...
available here - Centre for High Energy Physics
... • The algorithm can be looked upon as evolution of the quantum state from jsi to jt i, governed by a Hamiltonian containing two terms, jt iht j and jsihsj. The former represents a potential energy attracting the state toward jt i, and the latter represents a kinetic energy diffusing the state throug ...
... • The algorithm can be looked upon as evolution of the quantum state from jsi to jt i, governed by a Hamiltonian containing two terms, jt iht j and jsihsj. The former represents a potential energy attracting the state toward jt i, and the latter represents a kinetic energy diffusing the state throug ...
Physics Today
... In the late 1960s, Percival and coworkers developed a versatile computer code, classical-trajectory Monte Carlo, for modeling three-body systems of charged particles, two of which are identical.8 (For an instructive review of classical simulations before 1968, see reference 9.) Eschewing Wannier’s r ...
... In the late 1960s, Percival and coworkers developed a versatile computer code, classical-trajectory Monte Carlo, for modeling three-body systems of charged particles, two of which are identical.8 (For an instructive review of classical simulations before 1968, see reference 9.) Eschewing Wannier’s r ...
A REPORT ON QUANTUM COMPUTING
... referred to as a 'qubit', exist in the classical 0 and 1 states, it can also be in a coherent superposition of both. When a qubit is in this state it can be thought of as existing in two universes, as a 0 in one universe and as a 1 in the other. An operation on such a qubit effectively acts on both ...
... referred to as a 'qubit', exist in the classical 0 and 1 states, it can also be in a coherent superposition of both. When a qubit is in this state it can be thought of as existing in two universes, as a 0 in one universe and as a 1 in the other. An operation on such a qubit effectively acts on both ...
The Classical Universes of the No-Boundary Quantum State
... Classical Prediction in MSS and The Classicality Constraint •Following the NRQM analogy this semiclassical form will predict classical Lorentian histories that are the integral curves of S, ie the solutions to: ...
... Classical Prediction in MSS and The Classicality Constraint •Following the NRQM analogy this semiclassical form will predict classical Lorentian histories that are the integral curves of S, ie the solutions to: ...
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.