Suter, DieterKrojanski, Hans G.2008-06-022008-06-022006-10-11Krojanski, Hans G.; Suter, Dieter: Reduced Decoherence in Large Quantum Registers. In: Physical Review Letters Jg. 97(2006), 150503.http://hdl.handle.net/2003/25394http://dx.doi.org/10.17877/DE290R-2761Among the biggest obstacles for building larger (and thus more powerful) quantum-information processors is decoherence, the decay of quantum-information by the coupling between the quantum register and its environment. Procedures for reducing decoherence processes will be essential for successful operation of larger quantum processors. We study model quantum registers consisting of up to 4900 qubits and measure their decay as a function of the register size. We demonstrate that appropriate sequences of qubit rotations reduce the coupling between system and environment for all sizes of the quantum register, thus preserving the quantum-information 50 times longer than without decoupling.en©2006 The American Physical Society530Text10.1103/PhysRevLett.97.150503http://dx.doi.org/10.1103/PhysRevLett.97.150503