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Frontiers in Quantum Science and Technology, 2023 We investigate the dynamics of a maximally entangled mixed state (MEMS) under the action of correlated noise channels. The channel acts in a way that its successive uses are correlated. We have studied the MEMS properties, including quantum coherence and
Natasha Awasthi +2 more
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Convex decomposition of dimension-altering quantum channels [PDF]
Int. J. Quantum Inform. Vol. 14, No. 8, 1650045 (2016), 2015 Quantum channels, which are completely positive and trace preserving mappings, can alter the dimension of a system; e.g., a quantum channel from a qubit to a qutrit. We study the convex set properties of dimension-altering quantum channels, and particularly the channel decomposition problem in terms of convex sum of extreme channels. We provide various
arxiv +1 more source
Protecting Quantum Fisher Information in Correlated Quantum Channels [PDF]
Annals of Physics, 2019 Quantum Fisher information (QFI) has potential applications in quantum metrology tasks. QFI is investigated when the consecutive actions of a quantum channel on the sequence of qubits have partial classical correlations. The results showed that while the
Ming‐Liang Hu, Huifeng Wang
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Selfcomplementary quantum channels [PDF]
, 2016 Selfcomplementary quantum channels are characterized by such an interaction between the principal quantum system and the environment that leads to the same output states of both interacting systems.
Roga, Wojciech +2 more
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Fidelity and Fisher information on quantum channels
New Journal of Physics, 2017 The fidelity function for quantum states has been widely used in quantum information science and frequently arises in the quantification of optimal performances for the estimation and distinguishing of quantum states.
Haidong Yuan, Chi-Hang Fred Fung
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Proceedings, 2019 We report the presence of an asymmetry that arises when considering the performances of quantum communication channels whose outputs are connected via a rigid, distance-preserving, yet not completely-positive, transformation. From a classical perspective
Vittorio Giovannetti, Matteo Rosati
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Operational characterization of incompatibility of quantum channels with quantum state discrimination [PDF]
Physical Review A, 2019 A collection of quantum channels is called incompatible if they cannot be obtained as marginals from a single channel. No-cloning theorem is the most prominent instance of incompatibility of quantum channels. We show that every collection of incompatible
J. Mori
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Quantum Feedback Channels [PDF]
, 2004 In Shannon information theory the capacity of a memoryless communication channel cannot be increased by the use of feedback. In quantum information theory the no-cloning theorem means that noiseless copying and feedback of quantum information cannot be ...
Bowen, Garry
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Quantum Capacity Approaching Codes for the Detected-Jump Channel [PDF]
Physical Review A, vol. 82, no. 6, December 2010, 062324, 2010 The quantum channel capacity gives the ultimate limit for the rate at which quantum data can be reliably transmitted through a noisy quantum channel. Degradable quantum channels are among the few channels whose quantum capacities are known. Given the quantum capacity of a degradable channel, it remains challenging to find a practical coding scheme ...
arxiv +1 more source
Coherence in logical quantum channels [PDF]
New Journal of Physics, 2019 We study the effectiveness of quantum error correction against coherent noise. Coherent errors (for example, unitary noise) can interfere constructively, so that in some cases the average infidelity of a quantum circuit subjected to coherent errors may ...
Joseph K Iverson, J. Preskill
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