Results 11 to 20 of about 228,551 (326)
Nonunitary quantum circuit [PDF]
International Journal of Quantum Information, 2004 A quantum circuit is generalized to a nonunitary one whose constituents are nonunitary gates operated by quantum measurement. It is shown that a specific type of one-qubit nonunitary gates, the controlled-NOT gate, as well as all one-qubit unitary gates ...
HIROAKI TERASHIMA +2 more
core +7 more sources
Quantum circuit unoptimization
Physical Review ResearchOptimization of circuits is an essential task for both quantum and classical computers to improve their efficiency. In contrast, classical logic optimization is known to be difficult, and a lot of heuristic approaches have been developed so far.
Yusei Mori +5 more
doaj +3 more sources
Soliton confinement in a quantum circuit. [PDF]
Nat Commun, 2023 AbstractConfinement of topological excitations into particle-like states - typically associated with theories of elementary particles - are known to occur in condensed matter systems, arising as domain-wall confinement in quantum spin chains. However, investigation of confinement in the condensed matter setting has rarely ventured beyond lattice spin ...
Roy A, Lukyanov SL.
europepmc +5 more sources
Circuit quantum electrodynamics [PDF]
Reviews of Modern Physics, 2021 Quantum mechanical effects at the macroscopic level were first explored in Josephson junction-based superconducting circuits in the 1980's. In the last twenty years, the emergence of quantum information science has intensified research toward using these circuits as qubits in quantum information processors.
Alexandre Blais +3 more
openaire +2 more sources
Quantum Circuit Architecture [PDF]
Physical Review Letters, 2008 10 eps figures + Qcircuit ...
CHIRIBELLA, GIULIO +2 more
openaire +5 more sources
Heat Bath in a Quantum Circuit. [PDF]
Entropy (Basel)We discuss the concept and realization of a heat bath in solid state quantum systems. We demonstrate that, unlike a true resistor, a finite one-dimensional Josephson junction array or analogously a transmission line with non-vanishing frequency spacing, commonly considered as a reservoir of a quantum circuit, does not strictly qualify as a Caldeira ...
Pekola JP, Karimi B.
europepmc +6 more sources
Quantum circuits for quantum channels [PDF]
Physical Review A, 2017 We study the implementation of quantum channels with quantum computers while minimizing the experimental cost, measured in terms of the number of Controlled-NOT (C-NOT) gates required (single-qubit gates are free). We consider three different models. In the first, the Quantum Circuit Model (QCM), we consider sequences of single-qubit and C-NOT gates ...
Iten, Raban +2 more
openaire +3 more sources
Triunitary quantum circuits [PDF]
Physical Review Research, 2021 We introduce a novel class of quantum circuits that are unitary along three distinct "arrows of time". These dynamics share some of the analytical tractability of "dual-unitary" circuits, while exhibiting distinctive and richer phenomenology. We find that two-point correlations in these dynamics are strictly confined to three directions in $(1+1 ...
Cheryne Jonay +2 more
openaire +3 more sources
Quantum circuit learning [PDF]
Physical Review A, 2018 We propose a classical-quantum hybrid algorithm for machine learning on near-term quantum processors, which we call quantum circuit learning. A quantum circuit driven by our framework learns a given task by tuning parameters implemented on it. The iterative optimization of the parameters allows us to circumvent the high-depth circuit.
Mitarai, K. +3 more
openaire +3 more sources
Quantum circuits for isometries [PDF]
Physical Review A, 2016 We consider the decomposition of arbitrary isometries into a sequence of single-qubit and Controlled-NOT (C-NOT) gates. In many experimental architectures, the C-NOT gate is relatively 'expensive' and hence we aim to keep the number of these as low as possible.
Iten, Raban +4 more
openaire +3 more sources