Universal Dephasing Control During Quantum Computation

Abstract

Dephasing is a ubiquitous phenomenon that leads to the loss of coherence in quantum systems and the corruption of quantum information. We present a universal dynamical control approach to combat dephasing during all stages of quantum computation, namely, storage, single- and two-qubit operators. We show that (a) tailoring multi-frequency gate pulses to the dephasing dynamics can increase fidelity; (b) cross-dephasing, introduced by entanglement, can be eliminated by appropriate control fields; (c) counter-intuitively and contrary to previous schemes, one can increase the gate duration, while simultaneously increasing the total gate fidelity.

4 pages,3 figures

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• Decoherence control: Universal protection of two-qubit states and two-qubit gates using continuous driving fields
• Experimental protection of quantum gates against decoherence and control errors
• Bright and Dark periods in the Entanglement Dynamics of Interacting Qubits in Contact with the Environment
• Quantum Zeno and Anti-Zeno probes of noise correlations in photon polarisation
• Task-dependent control of open quantum systems
• Thermal Baths as Quantum Resources: More Friends than Foes?
• No-go theorem and optimization of dynamical decoupling against noise with soft cutoff
• Diffusive lossless energy and coherence transfer by noisy coupling
• Universal set of Dynamically Protected Gates for Bipartite Qubit Networks II: Soft Pulse Implementation of the [[5,1,3]] Quantum Error Correcting Code
• Filter-design perspective applying to dynamical decoupling of a multi-qubit system