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- Heidelberg UniversityDE133 papers
- Humboldt-Universität zu BerlinDE129 papers
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6 papers · 2 filters
Optimal pulse spacing for dynamical decoupling in the presence of a purely-dephasing spin-bath
Ashok Ajoy, Gonzalo A. Alvarez, Dieter Suter
Maintaining quantum coherence is a crucial requirement for quantum computation; hence protecting quantum systems against their irreversible corruption due to environmental noise is…
Performance comparison of dynamical decoupling sequences for a qubit in a rapidly fluctuating spin-bath
Gonzalo A. Alvarez, Ashok Ajoy, Xinhua Peng +1
Avoiding the loss of coherence of quantum mechanical states is an important prerequisite for quantum information processing. Dynamical decoupling (DD) is one of the most effective…
Zeno and anti-Zeno polarization control of spin-ensembles by induced dephasing
Gonzalo A. Alvarez, D. D. Bhaktavatsala Rao, Lucio Frydman +1
We experimentally and theoretically demonstrate the purity (polarization) control of qubits entangled with multiple spins, using induced dephasing in nuclear magnetic resonance (NM…
Decoherence as attenuation of mesoscopic echoes in a spin-chain channel
Gonzalo A. Alvarez, Ernesto P. Danieli, Patricia R. Levstein +1
An initial local excitation in a confined quantum system evolves exploring the whole system, returning to the initial position as a mesoscopic echo at the Heisenberg time. We consi…
NMR quantum simulation of localization effects induced by decoherence
Gonzalo A. Alvarez, Dieter Suter
The loss of coherence in quantum mechanical superposition states limits the time for which quantum information remains useful. Similarly, it limits the distance over which quantum…
Rigorous Bounds for Optimal Dynamical Decoupling
Götz S. Uhrig, Daniel A. Lidar
We present rigorous performance bounds for the optimal dynamical decoupling pulse sequence protecting a quantum bit (qubit) against pure dephasing. Our bounds apply under the assum…