Decoherence Assisted Single Electron Trapping at Room Temperature

Kento Taniguchi, Atsushi Noguchi

We report the image current detection of electrons in a room-temperature Paul trap at microwave frequencies. By selectively leveraging distinct cavity modes for trapping and detection, our approach effectively extracts electron signals otherwise buried in the microwave drive used for pseudo-potential formation. When the trapped electrons resonate with the cavity mode, we observe a mode excitation and its exponential decay attributed to resistive cooling. Detuning electrons from the cavity resonance halts this decay, and sweeping electrons' secular frequency reveals their oscillatory spectrum. Implementing this experiment at cryogenic temperatures could enable the image current detection and ground-state cooling of a single electron in Paul traps.

Pritiraj Mohanty

Matthew C. Smith, A. D. Leu, K. Miyanishi +2 more

We report the achievement of single-qubit gates with sub-part-per-million error rates, in a trapped-ion ^{43}Ca^{+} hyperfine clock qubit. We explore the speed and fidelity trade-off for gate times 4.4≤t_{g}≤35 μs, and benchmark a minimum error per Clifford gate of 1.5(4)×10^{-7}. Calibration errors are suppressed to <10^{-8}, leaving qubit decoherence (T_{2}≈70 s), leakage, and measurement as the dominant error contributions. The ion is held above a microfabricated surface-electrode trap that incorporates a chip-integrated microwave resonator for electronic qubit control; the trap is operated at room temperature without magnetic shielding.

Pritiraj Mohanty

Yossi Paltiel

Michael Allan Bahtaji

Geometric Zero-Sum Trapping: From Euclidean Curvature to Electron-Spin Qubits for Room-Temperature Photonic Memory Abstract We introduce Geometric Zero-Sum Trapping, where input intensity tunes the effective optical curvature of a dielectric sphere and nanofiber via an optical analog of Euler’s relation. High intensity drives self-retracing path density, pushing geometry from non-Euclidean to near-Euclidean with trapping coefficient B ≈ 1. Low intensity yields B ≪ 1, enabling ns release. We link this geometric transition to collective electron spin deflection in reflection, refraction, and diffraction. The mechanism scales to the atomic limit, enabling light storage in a single electron spin without a physical cavity, providing a path to room-temperature photonic bits.