Decoherence control by quantum decoherence itself

Decoherence control by quantum decoherence itself

We propose a general approach of protecting a two-level system against decoherence via quantum engineering of non-classical multiple superpositions of coherent states in a non-Markovian reservoir. The scheme surprisingly only uses the system-environment interaction responsible for the decoherence and projective measurements of the two-level system. We demonstrate the method on the example of an...

Decoherence by engineered quantum baths

Davide Rossini, Tommaso Calarco, 3 Vittorio Giovannetti, Simone Montangero, 4 and Rosario Fazio 1 NEST-CNR-INFM & Scuola Normale Superiore, piazza dei Cavalieri 7, I-56126 Pisa, Italy Dipartimento di Fisica, Università di Trento and BEC-CNR-INFM, I-38050 Povo, Italy ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA Institut für Theoretische Festkörperphysik, Universit...

Decoherence, Control and Symmetry in Quantum Computers

Quantum control experiment reveals solvation-induced decoherence.

Coherent control holds the promise of becoming a powerful spectroscopic tool for the study of complex molecular systems. Achieving control requires coherence in the quantum system under study. In the condensed phase, coherence is typically lost rapidly because of fluctuating interactions between the solvated molecule and its surrounding environment. We investigate the degree of attainable contr...

Scanning quantum decoherence microscopy.

The use of qubits as sensitive nanoscale magnetometers has been studied theoretically and recently demonstrated experimentally. In this paper we propose a new concept, in which a scanning two-state quantum system is used to probe a sample through the subtle effects of decoherence. Mapping both the Hamiltonian and decoherence properties of a qubit simultaneously provides a unique image of the ma...