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Shadow process tomography of quantum channels [PDF]
Physical Review A, 2021 Quantum process tomography is a critical capability for building quantum computers, enabling quantum networks, and understanding quantum sensors. Like quantum state tomography, the process tomography of an arbitrary quantum channel requires a number of ...
Jonathan Kunjummen +3 more
semanticscholar +1 more source
Generating random quantum channels [PDF]
Journal of Mathematics and Physics, 2020 Several techniques of generating random quantum channels, which act on the set of $d$-dimensional quantum states, are investigated. We present three approaches to the problem of sampling of quantum channels and show under which conditions they become ...
Ryszard Kukulski +4 more
semanticscholar +1 more source
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
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
doaj +1 more source
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
doaj +1 more source
Dilation, Discrimination and Uhlmann's Theorem of Link Products of Quantum Channels [PDF]
Chin. Phys. B 33, 030304 (2024), 2023 The study of quantum channels is the most fundamental theoretical problem in quantum information and quantum communication theory. The link product theory of quantum channels is an important tool for studying quantum networks. In this paper, we establish the Stinespring dilation theorem of the link product of quantum channels in two different ways ...
arxiv +1 more source
Quantifying Quantumness of Channels Without Entanglement
PRX Quantum, 2022 Quantum channels breaking entanglement, incompatibility, or nonlocality are defined as such because they are not useful for entanglement-based, one-sided device-independent, or device-independent quantum-information processing, respectively.
Huan-Yu Ku +10 more
doaj +1 more source
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
core +3 more sources
Trade-off capacities of the quantum Hadamard channels [PDF]
, 2010 Coding theorems in quantum Shannon theory express the ultimate rates at which a sender can transmit information over a noisy quantum channel. More often than not, the known formulas expressing these transmission rates are intractable, requiring an ...
Bradler, Kamil +3 more
core +3 more sources
Entanglement of spin waves among four quantum memories [PDF]
, 2010 Quantum networks are composed of quantum nodes that interact coherently by way of quantum channels and open a broad frontier of scientific opportunities.
A Acín +48 more
core +3 more sources