2004/11/30 by Boris Ischi, B. Ischi, Michael Hilke +3 · 24 citations
Computer Science · Mathematics · Physics and Astronomy · #Algorithm #Diagonal #Function (biology) #Geometry #Linear subspace #Mathematics #Physics #Pure mathematics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum decoherence #Quantum mechanics #Qubit #State (computer science) #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.71.195325
published in Physical Review B 71(19) (American Physical Society) · 11 pages
openalex publication_date 2005/05/26 · arxiv created 2005/06/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate the decoherence process for a quantum register composed of N qubits coupled to an environment. We consider an environment composed of one common phonon bath and several electronic baths. This environment is relevant to the implementation of a charge based solid-state quantum computer. We explicitly compute the time evolution of all off-diagonal terms of the register's reduced density matrix. We find that in realistic configurations, ``superdecoherence'' and ``decoherence-free subspaces'' do not exist for an N-qubit system. This means that all off-diagonal terms decay, but not faster than e^\ensuremath-q(t)N, where q(t) is of the same order as the decay function of a single qubit.