Quantum control of the tin-vacancy spin qubit in diamond

Abstract

I. Tin-vacancy electronic structure model A. Tin-vacancy Hamiltonian B. Microwave drive of spin qubit C. Microwave drive results D. Realizing a lambda scheme II. Characterization of tin-vacancy lambda scheme parameters III. Modelling all-optical coherent control A. Analytical model B. Master equation model C. Gate fidelities IV. Sample fabrication V. Equipment set-up A. Experimental details on primary optical system B. Experimental details on second optical system C. Measurement conditions for main-text data VI. Coherent population trapping model and simulations VII. Intensity-correlation measurement under resonant excitation VIII. Ramsey signal analysis A. Serrodyne frequency ω S B. Two-photon detuning δ C. Differential AC Stark effect ∆ AC D. Ramsey simulation IX. Spin lifetime T 1 measurement

Quantum memories for fundamental physics in space

“…Although NVs are currently the most mature system, they lack optical efficiency compared to tin-vacancy (SnV) [53] or silicon-vacancy (SiV) [54] centers. In comparison to the low temperatures needed for longer coherence in SiV, similar or better coherence at temperatures above 1 K might be offered by SnV.…”

Topical White Paper: A Case for Quantum Memories in Space

“…Recently emerging alternative to the NV center is the family of group-IV color centers, such as SiV, GeV and SnV, which are insensitive to the environmental noise due to their inversion symmetry [103], even when incorporated into nanophotonic structures [104][105][106]. The resulting stable emission line, combined with high ZPL efficiency, transform-limited linewidths down to ∼ 30 MHz [106] with coherent access to electronic spins [107] at cryogenic temperatures makes these color centers a perfect candidate as single photon sources with built-in QM capability [108].…”

Indirect Control of the $\rm {}^{29}SiV^{-}$ Nuclear Spin in Diamond

“…The state of the art in diamond-based spin qubit implementations includes low temperature nanophotonics and coherent control of negatively charged group IV vacancies, as a result of their favourable optical and coherence properties at low temperatures (≤4 K) [1][2][3][4]. In particular, much progress has been made with the negatively charged silicon vacancy (SiV -) color center in diamond, which has emerged as a promising candidate for the implementation of a spin qubit [5][6][7][8][9][10].…”