A comparative study of system size dependence of the effect of non-unitary channels on different classes of quantum states

Geetu Narang, Shruti Dogra, Arvind*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We investigate the effect of different types of non-unitary quantum channels on multiqubit quantum systems. For an n-qubit system and a particular channel, in order to draw unbiased conclusions about the system as a whole as opposed to specific states, we evolve a large number of randomly generated states under the given channel. We increase the number of qubits and study the effect of system size on the decoherence processes. The entire scheme is repeated for various types of environments which include dephasing channel, depolarizing channel, collective dephasing channel and zero temperature bath. Non-unitary channels representing the environments are modeled via their Kraus operator decomposition or master equation approach. Further, for a given n we restrict ourselves to the study of particular subclasses of entangled states, namely the GHZ-type and W-type states. We generate random states within these classes and study the class behaviors under different quantum channels for various values of n.

Original languageEnglish
Article number397
JournalQuantum Information Processing
Volume19
Issue number11
DOIs
Publication statusPublished - 1 Nov 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Quantum channels
  • Quantum decoherence
  • Quantum dissipation

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