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9 papers · 2 filters
Observation of the ground-state-geometric phase in a Heisenberg XY model
Xinhua Peng, Sanfeng Wu, Jun Li +2
Geometric phases play a central role in a variety of quantum phenomena, especially in condensed matter physics. Recently, it was shown that this fundamental concept exhibits a conn…
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…
High Order Coherent Control Sequences of Finite-Width Pulses
S. Pasini, P. Karbach, G. S. Uhrig
The performance of sequences of designed pulses of finite length is analyzed for a bath of spins and it is compared with that of sequences of ideal, instantaneous pulses. The d…
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…