Results 41 to 50 of about 6,488,304 (373)
Variational quantum algorithm with information sharing [PDF]
npj Quantum Information, 2021 We introduce an optimisation method for variational quantum algorithms and experimentally demonstrate a 100-fold improvement in efficiency compared to naive implementations. The effectiveness of our approach is shown by obtaining multi-dimensional energy
C. Self +7 more
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Quantum algorithmic differentiation [PDF]
Quantum Information and Computation, 2021 In this work we present an algorithm to perform algorithmic differentiation in the context of quantum computing. We present two versions of the algorithm, one which is fully quantum and one which employees a classical step (hybrid approach). Since the implementation of elementary functions is already possible on quantum computers, the scheme that we ...
Giuseppe Colucci, Francesco Giacosa
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TOOLS FOR QUANTUM ALGORITHMS [PDF]
International Journal of Modern Physics C, 1999 We present efficient implementations of a number of operations for quantum computers. These include controlled phase adjustments of the amplitudes in a superposition, permutations, approximations of transformations and generalizations of the phase adjustments to block matrix transformations.
Tad Hogg +3 more
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Quantum algorithm for Petz recovery channels and pretty good measurements [PDF]
Physical Review Letters, 2020 The Petz recovery channel plays an important role in quantum information science as an operation that approximately reverses the effect of a quantum channel.
Andr'as Gily'en +4 more
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Quantum defragmentation algorithm [PDF]
Physical Review A, 2010 In this addendum of our paper [D. Burgarth and V. Giovannetti, Phys. Rev. Lett. 99, 100501 (2007)] we prove that during the transformation that allows one to enforce control by relaxation on a quantum system, the ancillary memory can be kept at a finite size, independently from the fidelity one wants to achieve.
BURGARTH D, GIOVANNETTI, VITTORIO
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Quantum Algorithms for Josephson Networks [PDF]
Physical Review Letters, 2001 We analyze possible implementations of quantum algorithms in a system of (macroscopic) Josephson charge qubits. System layout and parameters to realize the Deutsch algorithm with up to three qubits are provided. Special attention is paid to the necessity of entangled states in the various implementations.
Jens Siewert, Rosario Fazio
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Quantum Algorithm for High Energy Physics Simulations.
Physical Review Letters, 2021 Simulating quantum field theories is a flagship application of quantum computing. However, calculating experimentally relevant high energy scattering amplitudes entirely on a quantum computer is prohibitively difficult.
B. Nachman +3 more
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Variational quantum algorithm for estimating the quantum Fisher information [PDF]
Physical Review Research, 2020 The Quantum Fisher information (QFI) quantifies the ultimate precision of estimating a parameter from a quantum state, and can be regarded as a reliability measure of a quantum system as a quantum sensor.
J. Beckey +3 more
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Quantum Algorithms for Quantum Field Theories [PDF]
Science, 2012 Quantum Leap? Quantum computers are expected to be able to solve some of the most difficult problems in mathematics and physics. It is not known, however, whether quantum field theories (QFTs) can be simulated efficiently with a quantum computer.
Jordan, Stephen P. +2 more
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Quantum annealing with twisted fields
New Journal of Physics, 2022 Quantum annealing (QA) is a promising method for solving combinational optimization problems and performing quantum chemical calculations. The main sources of errors in QA are the effects of decoherence and non-adiabatic transition.
Takashi Imoto +3 more
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