Argonne National Laboratory

Research Highlight | Center for Nanoscale Materials

Ultralong coherence of an electron charge qubit
In a Nature Physics paper, scientists report on an electron charge qubit with record long coherence time and strong coupling of two qubits.
Two single electron qubits (blue and green balls) on solid neon (transparent square slabs on top of the circuit chip) with ultralong coherence time, strongly coupled with a common superconducting microwave resonator (red circuit lines).

Scientific Achievement

The experimental realization of electron charge qubits with a record long coherence time of 0.1 ms and the simultaneous strong coupling of two qubits with a common resonator.

Significance and Impact

This work demonstrates single electron qubits trapped on solid neon as a new promising platform for universal quantum computing.

Research Details

  • The quantum coherence of the electron on Ne qubits is significantly improved by Ne annealing, trapping potential stabilization, and the charge-noise-insensitive (sweet) spot qubit operations.
  • Ultralong relaxation time and coherence time, 𝑇1,𝑇2𝐸~0.1 ms with high-fidelity single-qubit gates and single-shot readout, outperforming all existing charge qubits to date.
  • The dilution refrigerator system at the CNM was used.

DOI: 10.1038/s41567-023-02247-5

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About Argonne’s Center for Nanoscale Materials
The Center for Nanoscale Materials is one of the five DOE Nanoscale Science Research Centers, premier national user facilities for interdisciplinary research at the nanoscale supported by the DOE Office of Science. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE’s Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge, Sandia and Los Alamos National Laboratories. For more information about the DOE NSRCs, please visit https://​sci​ence​.osti​.gov/​U​s​e​r​-​F​a​c​i​l​i​t​i​e​s​/​U​s​e​r​-​F​a​c​i​l​i​t​i​e​s​-​a​t​-​a​-​G​lance.

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