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Gold dithiolene radical holds a 21 μs spin qubit
Neutral [Au(adt)2] stores the unpaired electron on the ligand, giving phase-memory times up to 21 μs in low-spin solvents and 1.44 μs when doped into a nickel molecular semiconductor.
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Where does the unpaired electron reside in [Au(adt)2]?
On the ligand radical; gold is Au(III) with tiny 5d character in the SOMO.
Source: Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals · DOI · quote verified
What maximum TM was measured in frozen solution?
21 μs in 4:1 CS2/CCl4, the solvent with fewest nuclear spins.
Source: Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals · DOI · quote verified
What TM was seen at 10 K before the gz orientation boost?
15.6 μs, rising 12% to 17.6 μs at 375.7 mT (gz).
Source: Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals · DOI · quote verified
What happens on doping into [Ni(adt)2]?
TM drops to 1.44 μs at 10 K because the host is a semiconductor that shortens T1.
Source: Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals · DOI · quote verified
Why were CDCl3, CCl4, CS2 and Cl3CCN chosen?
Their nuclei have small magnetogyric ratios, an order of magnitude below 1H.
Source: Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals · DOI · quote verified
What redox waves does the anion 1 show?
Two reversible 1e processes at −0.143 V and +0.384 V vs Fc+/0 in CH2Cl2.
Source: Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals · DOI · quote verified
How is the S=1/2 neutral complex 2 made?
Oxidation of 1 with 0.5 equiv. I2 in CH2Cl2.
Source: Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals · DOI · quote verified
What limits measurement above 80 K?
Gold SOC amplifies the Raman process that speeds T1 above 20 K.
Source: Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals · DOI · quote verified
How does T1,s change from 5 to 80 K in solution?
Exponentially from 58.3 ms to 1.6 ms.
Source: Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals · DOI · quote verified
What Au–S distances support Au(III) in both oxidation states?
2.3165 Å in 1 and 2.3006 Å in 2, i.e. both +III.
Source: Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals · DOI · quote verified
Why is quadrupole larger than Au hyperfine?
Spin is on the ligand; Au has (dx2−y2)0 configuration.
Source: Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals · DOI · quote verified