Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals

Abstract

An organic radical attached to gold represents an electrically addressable prototype electron spin qubit with an impressively long coherence lifetime.

Metal–ligand covalency enables room temperature molecular qubit candidates

“…This unexpected hastening of relaxation time may be the result of the increased spin-orbit coupling from the selenium-donor atoms. 54,55 This prompts us to conclude the heavy atom effect from donor atoms strongly affects T 1 in highly covalent systems. Finally, the combined spin-orbit coupling of the metal-based spin with the low-energy vibrational modes in the vanadium(IV) complexes accounts for their fast T 1 rates at higher temperatures.…”

Hybrid Spintronic Materials from Conducting Polymers with Molecular Quantum Bits

“…From this, we can conclude that quantum coherence is largely preserved even in the presence of mobile charge carriers, in contrast to what had been observed previously. [ 25 ] In the dithiolate materials of ref. [ 25 ] , electrical conductivity is engendered by suitable stacking of the dithiolate ligands in the solid, combined with charge doping.…”

“…[25] In the dithiolate materials of ref. [25], electrical conductivity is engendered by suitable stacking of the dithiolate ligands in the solid, combined with charge doping. The quantum bit is prepared by one-electron oxidation of the gold complex, which can be viewed as molecular-level charge doping, and [36] the relevant orbital is largely localized on the dithiolate ligand.…”

“…[5,[24][25][26] In fact, a recent report indicated that the presence of mobile charge carriers dramatically decreases the coherence time of molecular quantum bits by more than a factor of ten in such systems, which suggested that the electrical readout of molecular quantum bits may remain elusive. [25] An alternative to these small-molecule systems is presented by hybrid materials consisting of conducting polymers for the conductivity functionality and MQBs for the quantum coherence. The advantage of this approach is that both components can be optimized separately, and that the resulting material is flexible and easily processable from solution.…”

Blatter‐Radical‐Grafted Mesoporous Silica as Prospective Nanoplatform for Spin Manipulation at Ambient Conditions

“…Some organic radicals, similar to the metal complexes, can be assembled into functional architectures such as MOFs [42] . Therefore, pursuing the “radical approach” to spin qubits is quite promising [43, 44] . Similar to other qubit candidates, it requires optimization of stability, increase of T m , and development of strategies for mutual arrangement of the qubits.…”