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Computing Quantum Channel Capacities [PDF]
IEEE Transactions on Information Theory, 2021 v4: 22 pages, 4 figures, new ...
Navneeth Ramakrishnan +3 more
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Unitary circuits of finite depth and infinite width from quantum channels [PDF]
Physical review B, 2019 We introduce an approach to compute reduced density matrices for local quantum unitary circuits of finite depth and infinite width. Suppose the time-evolved state under the circuit is a matrix-product state with bond dimension $D$; then the reduced ...
S. Gopalakrishnan, A. Lamacraft
semanticscholar +1 more source
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
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Quantumness of quantum channels [PDF]
Physical Review A, 2018 Quantum coherence is a fundamental aspect of quantum physics and plays a central role in quantum information science. This essential property of the quantum states could be fragile under the influence of the quantum operations. The extent to which quantum coherence is diminished depends both on the channel and the incoherent basis.
Shahbeigi, Fereshte +1 more
openaire +2 more sources
Quantum capacity analysis of multi-level amplitude damping channels
Communications Physics, 2021 Estimating the capacity of quantum channels is relevant to understand at which rate quantum information can be exchanged. Here, the authors introduce multi-level amplitude damping channels that generalize the qubit amplitude damping noise model, analyse ...
Stefano Chessa, Vittorio Giovannetti
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Operational applications of the diamond norm and related measures in quantifying the non-physicality of quantum maps [PDF]
Quantum, 2021 Although quantum channels underlie the dynamics of quantum states, maps which are not physical channels — that is, not completely positive — can often be encountered in settings such as entanglement detection, non-Markovian quantum dynamics, or error ...
Bartosz Regula, Ryuji Takagi, Mile Gu
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Experimental quantum communication enhancement by superposing trajectories
Physical Review Research, 2021 In quantum communication networks, wires represent well-defined trajectories along which quantum systems are transmitted. In spite of this, trajectories can be used as a quantum control to govern the order of different noisy communication channels, and ...
Giulia Rubino +10 more
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Infinite-Dimensional Programmable Quantum Processors
PRX Quantum, 2021 A universal programmable quantum processor uses “program” quantum states to apply an arbitrary quantum channel to an input state. We generalize the concept of a finite-dimensional programmable quantum processor to infinite dimension assuming an energy ...
Martina Gschwendtner, Andreas Winter
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Performance of polar codes for quantum and private classical communication [PDF]
, 2012 We analyze the practical performance of quantum polar codes, by computing rigorous bounds on block error probability and by numerically simulating them.
Dutton, Zachary +2 more
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Contraction of Private Quantum Channels and Private Quantum Hypothesis Testing [PDF]
IEEE Transactions on Information TheoryA quantum generalized divergence by definition satisfies the data-processing inequality; as such, the relative decrease in such a divergence under the action of a quantum channel is at most one. This relative decrease is formally known as the contraction
Theshani Nuradha, Mark M. Wilde
semanticscholar +1 more source