Electron States above the Surfaces of Solid Cryodielectrics for Quantum-Computing.

Single electrons on solid neon as a solid-state qubit platform

“…Improvement to the device design and Ne growth process 55 , and operation at the charge noise "sweet spot" are expected to mitigate these decoherence issues. It has been theoretically calculated that the in-plane motional coherence of an electron on solid Ne surface can be several milliseconds 61 . Ultimately, utilizing the spin states through engineered spin-orbital coupling 16,20,52 can yield ultralong qubit coherence in excess of 1 s 52,[54][55][56] .…”

“…In contrast to He, which is a liquid (superfluid) even at zero temperature, unless a large pressure of at least 25 bar is applied, Ne spontaneously turns into a face-centered-cubic (fcc) crystal after passing its triple point at the elevated temperature T t = 24.556 K and moderate pressure P t = 0.43 bar [57][58][59][60] . At nearzero temperature, solid Ne can form a free surface to vacuum and serve as an ultraclean substrate with no uncontrollable impurities or electromagnetic noise 61,62 .…”

“…While the electron-on-solid-Ne (eNe) system can be considered conceptually as an extension to the historically more studied electronon-liquid-He (eHe) system, it renders much stronger surface rigidity that suppresses decoherence through surface excitations 52,68,69 . Compared with eHe that was proposed as a qubit platform over two decades ago 52,[68][69][70][71][72][73] , eNe embodies a potentially even more fascinating, solid-state qubit platform 56,61,74 .…”