PerspectiveQUANTUM OPTICS

All for one and one for all

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Science  05 Apr 2019:
Vol. 364, Issue 6435, pp. 30-31
DOI: 10.1126/science.aaw8823

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Summary

Quantum information (QI) has become a focus of research during the past two decades, with the goal of exploiting the potentialities offered by superposition and entanglement of quantum states (1). The first hardware implementations of QI relied on quantum systems hosting clean, well-isolated two-level systems such as atoms or ions. Despite the success of these systems, solid-state QI implementations promise robustness, miniaturization, established fabrication tools, scalability to large numbers of involved components, and easy connectivity to classical hardware. However, a major challenge is that the interaction of quantum states with the many-body environment in a crystal can compromise QI. In semiconductor nanostructures, the lattice nuclei offer sufficiently long QI storage times, but a truly coherent interface, which is needed to store QI faithfully in an ensemble of nuclear spins, has remained elusive. On page 62 of this issue, Gangloff et al. (2) report the realization of this goal for an electron with the nuclei in a quantum dot, which they achieved by exploiting hyperfine interactions.

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