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.
Source
Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals
Study at a glance
- Design
- Other — EPR spin-relaxation of [Au(adt)2]−/0 diluted in glassy solvents and isoelectronic Ni matrix
- N
- Molecular spin-qubit materials study — no sample N
- Population
- Gold dithiolene radical complexes in frozen solutions and Ni dilution solids
- Outcome
- Phase-memory times enabling single-qubit addressability
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Inspect source passages
Gold dithiolene radical holds a 21 μs spin qubit
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TM was 15.6 μs at 10 K and 17.6 μs at gz.
An exceedingly long phase memory time of 15.6 μs is recorded for 2 at 10 K, and this increases to 17.6 μs when the field position is shift to 375.7 mT corresponding to g z , an increase of 12% which aligns with the orientation dependence observed for T 1,s ( vide supra ).
Ni-host dilution gave TM of 1.44 μs at 10 K.
The solid dilution of 2 in [Ni(adt) 2 ] afforded the shortest T M,s of 1.44 μs at 10 K, an order of magnitude smaller than for the frozen solution samples ().
What they did
Authors prepared [Au(adt)2]−/0, assigned Au(III) ligand-radical character by XRD/EPR, measured T1 and TM from 5–80 K in CS2/CCl4-type solvents, and diluted the S=1/2 molecule in isoelectronic [Ni(adt)2].
What they found
TM reaches 21 μs in 4:1 CS2/CCl4 and 15.6–17.6 μs at 10 K in other glasses. Solid Ni dilution shortens TM to 1.44 μs at 10 K via faster T1 in the semiconductor. Hyperfine is tiny versus Au quadrupole because 5d admixture is small.
The limits
What it doesn't show
SOC still kills coherence above ~80 K; room-temperature addressable qubits are not demonstrated.
Key terms
- Phase memory time TM
- How long the electron-spin superposition stays coherent.
- T1
- Spin–lattice relaxation time.
- Ligand radical
- Unpaired electron on the dithiolene, not on Au 5d.
- adt
- Bis(p-anisyl)-1,2-ethenedithiolate ligand.
- SOC
- Spin–orbit coupling from Au that accelerates Raman relaxation above 20 K.
Flashcards
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Quiz yourself
The unpaired electron in [Au(adt)2] is:
Common questions
Where is the unpaired spin?
On the ligand; Au is +III.
Best TM?
21 μs in 4:1 CS2/CCl4.
TM in the Ni host at 10 K?
1.44 μs.
Why low-γ solvents?
Weaker nuclear magnetic moments slow decoherence.
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