Qubit-qunit decomposition of quantum channel

2008/07/01 by Constantin V. Usenko, Usenko, Constantin V.
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum Physics (quant-ph)

paper · pdf · doi:10.48550/arxiv.0807.0036

openalex publication_date 2008/07/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Problem of classification of parallel quantum channels for information transfer is studied by method of ladder operators. Detailed compared to http://arxiv.org/abs/quant-ph/0702076 presentation of method of ladder operators is given. Examples of paired channel and qubit-qunit pair are added. Relations between eigenvalues of density matrices of composite channel and its subchannels determining presence/absence of entanglement of arbitrary mixed state of channel are obtained.

Citations

• Detecting entanglement in two mode squeezed states by particle counting
• Entanglement of Formation of an Arbitrary State of Two Qubits

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