Abstract
One of the challenges in the field of quantum sensing and information processing is to selectively address and coherently manipulate highly homogeneous qubits subject to external perturbations. Here, we present room-temperature coherent control of high-dimensional quantum bits, the so-called qudits, associated with vacancy-related spins in silicon carbide enriched with nuclear spin-free isotopes. In addition to the excitation of a spectrally narrow qudit mode at the pump frequency, several other modes are excited in the electron spin resonance spectra whose relative positions depend on the external magnetic field. We develop a theory of multipole spin dynamics and demonstrate selective quantum control of homogeneous spin packets with sub-MHz spectral resolution. Furthermore, we perform two-frequency Ramsey interferometry to demonstrate absolute dc magnetometry, which is immune to thermal noise and strain inhomogeneity.
Highlights
One of the challenges in the field of quantum sensing and information processing is to selectively address and coherently manipulate highly homogeneous qubits subject to external perturbations
Optical pumping results in a preferential population of either the mS = ± 3/2 or mS = ± 1/2 states. Such a spin alignment is theoretically described by the contributions to the diagonal components of the spin-density matrix δρ+3/2,+3/2 = δρ−3/2,−3/2 = −δρ1/2,1/2 = −δρ−1/2,−1/2
Measurements Nos. 1 3 in Table 2 demonstrate that the effective magnetic field Beff seen by different spin packets, which are selected by different vpump, is the same within the error bars
Summary
The divacancy centers posses the triplet ground state (S = 1), to the NV− centers in diamond. They have been recently used to demonstrate a variety of prominent examples of the quantum phenomena in solids[8,13], including the quantum entanglement in a macroscopic spin ensemble at ambient conditions[14]. The triplet ground states of both the NV− centers in diamond and divacancies in SiC impose limitations on their use as qudits. These limitations are lifted for the centers with the S = 3/2
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