Single ion qubit with estimated coherence time exceeding one hour

P Wang, CY Luan, M Qiao, M Um, J Zhang… - Nature …, 2021 - nature.com
Realizing a long coherence time quantum memory is a major challenge of current quantum
technology. Until now, the longest coherence-time of a single qubit was reported as 660 s in …

Restrictions on realizable unitary operations imposed by symmetry and locality

I Marvian - Nature Physics, 2022 - nature.com
According to a fundamental result in quantum computing, any unitary transformation on a
composite system can be generated using so-called 2-local unitaries that act only on two …

Fundamental accuracy-resolution trade-off for timekeeping devices

F Meier, E Schwarzhans, P Erker, M Huber - Physical Review Letters, 2023 - APS
From a thermodynamic point of view, all clocks are driven by irreversible processes.
Additionally, one can use oscillatory systems to temporally modulate the thermodynamic flux …

Limits on atomic qubit control from laser noise

ML Day, PJ Low, B White, R Islam, C Senko - npj Quantum Information, 2022 - nature.com
Technical noise present in laser systems can limit their ability to perform high fidelity
quantum control of atomic qubits. The ultimate fidelity floor for atomic qubits driven with laser …

Using cryogenic CMOS control electronics to enable a two-qubit cross-resonance gate

D Underwood, JA Glick, K Inoue, DJ Frank… - PRX Quantum, 2024 - APS
Qubit control electronics composed of CMOS circuits are of critical interest for next-
generation quantum computing systems. A CMOS-based application-specific integrated …

Practical limits for large-momentum-transfer clock atom interferometers

M Chiarotti, JN Tinsley, S Bandarupally, S Manzoor… - PRX Quantum, 2022 - APS
Atom interferometry on optical clock transitions is being pursued for numerous long-baseline
experiments both terrestrially and for future space missions. Crucial to meeting the required …

A cryo-CMOS, low-power, low-noise, phase-locked loop design for quantum computers

K Xin, M Lai, F Lv, K Guo, Z Pang, C Xu, G Zhang… - Electronics, 2023 - mdpi.com
This paper analyzes the performance requirements that need to be met by a clock generator
applied to a low-temperature quantum computer and analyzes the negative effects on the …

Quantum gates robust to secular amplitude drifts

QD Su, R Bruinsma, WC Campbell - Physical Review A, 2021 - APS
Quantum gates are typically vulnerable to imperfections in the classical control fields applied
to physical qubits to drive the gates. One approach to reduce this source of error is to break …