Arzhang Ardavan

Congratulations @dinahrose.bsky.social !

Electric-Field Quantum Sensing Exploiting a Photogenerated Charge-Transfer Triplet State in an Organic Molecule Molecular spin systems are promising platforms for quantum sensing due to their chemically tunable Hamiltonians, enabling tailored coherence properties and interactions with external fields. However, electric field sensing remains challenging owing to typically weak spin-electric coupling (SEC) and limited directional sensitivity. Addressing these issues by using heavy atoms exhibiting strong atomic spin–orbit couplings (SOC) often compromises spin coherence times. Here, we demonstrate coherent electric field sensing using a photogenerated charge-transfer (CT) spin triplet state in the organic molecule ACRSA (10-phenyl-10H,10’H-spiro[acridine-9,9’-anthracen]-10’-one). By embedding electric field pulses within a Hahn echo sequence, we coherently manipulate the spin triplet and extract both the magnitude and directional dependence of its SEC. The measured SEC strength is approximately 0.51 Hz/(V/m), which is comparable to values reported in systems with strong atomic SOC, illustrating that heavy atoms are not a prerequisite for electric-field sensitivity of spin states. Our findings position organic CT triplets as chemically versatile and directionally sensitive quantum sensors of E-fields that function without atomic-SOC-mediated mechanisms.

🧪 New results: we've extended our electrical control experiments to photo-excited molecular triplets. We find robust spin-electric coupling, even in a system without strong atomic spin-orbit coupling:
doi.org/10.1021/jacs...

Chemical tuning of quantum spin–electric coupling in molecular magnets - Nature Chemistry Molecular magnets may serve as engineerable spin qubit candidates for quantum information science; however, the magnetic fields often used for control can be challenging to confine. Now, it has been s...

🧪 Can we design molecules bearing quantum spins that we can control using electric fields? This would give us interesting opportunities in architecting molecular quantum technologies. Read about our recent progress:
doi.org/10.1038/s415...

🧪 Theory is one thing, experiment is quite another! We have taken the first steps in implementing an error-correctable quantum memory on a hyperfine-coupled qudit. Read about our experiment demonstrating the encoding and exploring its dynamics: journals.aps.org/prl/abstract...

Surely there's a case for condensed matter physics (CMP). Evidence for this? Periods of human history are labelled colloquially by the dominant CMP technology of the time: stone age, bronze age, iron age etc. Are we now living through the silicon age in BlueSky?

Arzhang Ardavan ‪University of Oxford‬ - ‪‪Cited by 11,121‬‬

Hi Manu,
As a condensed matter experimentalist, I'd love to join the BlueSky science community!
scholar.google.com/citations?us...
www.physics.ox.ac.uk/our-people/a...
www.magd.ox.ac.uk/people/profe...

All-Electrical Driving and Probing of Dressed States in a Single Spin The subnanometer distance between tip and sample in a scanning tunneling microscope (STM) enables the application of very large electric fields with a strength as high as ∼1 GV/m. This has allowed for...

Another important step towards quantum technologies based on atomic spins on surfaces from colleagues at IBS QNS: the very high electric fields available in the STM allow for strong driving of ESR transitions, giving rise to the creation and control of dressed states. pubs.acs.org/doi/full/10....

Fault-tolerant qubit encoding using a spin-7/2 qudit The authors propose a quantum memory, implemented on a spin-7/2 nucleus coupled to an electron spin-1/2 qubit, which provides $X$, $Y$, and $Z$ error correction using fewer quantum resources than the ...

High spin nuclei hyperfine coupled to electron spin qubits offer a valuable quantum resource. For example, we can use them to implement quantum error correction algorithms more efficiently than qubit-based codes of equivalent effectiveness: journals.aps.org/pra/abstract...