Protecting subspaces by acting on the outside

Abstract

Many quantum control tasks aim at manipulating the state of a quantum mechanical system within a finite subspace of states. However, couplings to the outside are often inevitable. Here we discuss strategies which keep the system in the controlled subspace by applying strong interactions onto the outside. This is done by drawing analogies to simple toy models and to the quantum Zeno effect. Special attention is paid to the constructive use of dissipation in the protection of subspaces.

16 pages, 10 figures

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Cited by in corpus (5)

• Experimental protection against evolution of states in a subspace via a super-Zeno scheme on an NMR quantum information processor
• Efficient long-distance energy transport in molecular systems through adiabatic passage
• External-level assisted cooling by measurement
• Generating single-mode behavior in fiber-coupled optical cavities
• Unconventional mechanism of virtual-state population through dissipation