Germanium Vacancy in Diamond Quantum Memory Exceeding 20 ms

Abstract

Negatively charged group-IV defects in diamond show great potential as quantum network nodes due to their efficient spin-photon interface. However, reaching sufficiently long coherence times remains a challenge. In this work, we demonstrate coherent control of germanium vacancy center (GeV) at millikelvin temperatures and extend its coherence time by several orders of magnitude to more than 20 ms. We model the magnetic and amplitude noise as an Ornstein-Uhlenbeck process, reproducing the experimental results well. The utilized method paves the way to optimized coherence times of group-IV defects in various experimental conditions and their successful applications in quantum technologies

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• High-Fidelity Electron Spin Gates for Scaling Diamond Quantum Register
• Efficient Microwave Spin Control of Negatively Charged Group-IV Color Centers in Diamond
• The impact of strain on the GeV-color center in diamond
• Control of solid-state nuclear spin qubits using an electron spin-1/2
• SUPER and femtosecond spin-conserving coherent excitation of a tin-vacancy color center in diamond
• Magneto-optical properties of Group-IV--vacancy centers in diamond upon hydrostatic pressure
• A Concise Primer on Solid-State Quantum Emitters
• High-fidelity control of a ${}^{13}$C nuclear spin coupled to a tin-vacancy center in diamond
• Optical probing of phononic properties of a tin-vacancy color center in diamond
• Efficiency of optimal control for noisy spin qubits in diamond
• Quantum Orbital-State Control of a Neutral Nitrogen-Vacancy Center at Millikelvin Temperatures
• Quantifying electron-nuclear spin entanglement dynamics in central-spin systems using one-tangles