Entanglement and decoherence in near-critical qubit chains

Abstract

We study the problem of environmentally-induced decoherence in a near-critical one-dimensional system of N>>1 coupled qubits. Using the Jordan-Wigner fermion representation of the qubit operators we identify the decoherence rates relevant for the two-qubit reduced density matrix. We find that a desirable onset of massive shared entanglement in the near-critical regime comes at the expense of decoherence which also tends to increase as the system is tuned towards criticality. Our results reveal rather contradictory general requirements that future designs of a qubit chain-based quantum information processor will need to satisfy.

Latex, 5 pages, no figures

References in corpus (5)

• Scaling of Entanglement close to a Quantum Phase Transitions
• Entanglement in a simple quantum phase transition
• Decoherence of quantum registers
• Gauge (non-)invariant Green functions of Dirac fermions coupled to gauge fields
• Elusive physical electron propagator in QED-like effective theories

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