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SUMMARY:Semiconductor Spin-Qubit Arrays for Axion Dark Matter Search
DTSTART;VALUE=DATE-TIME:20260811T082000Z
DTEND;VALUE=DATE-TIME:20260811T084000Z
DTSTAMP;VALUE=DATE-TIME:20260824T135009Z
UID:indico-contribution-2693@indico.itp.ac.cn
DESCRIPTION:Speakers: Xiangjun Tan (University College London)\nAxions and
  axion-like particles are compelling dark-matter candidates whose derivati
 ve couplings to fermion spins generate an oscillatory\, spin-dependent eff
 ective field\, often referred to as the axion wind. This talk explores sem
 iconductor quantum-dot spin qubits as frequency-resolved quantum sensors f
 or axion-induced spin dynamics and\, more broadly\, as a platform for weak
 -field detection at the nanoscale. By mapping the axion–spin interaction
  or other weak effective-field perturbations onto controlled phase accumul
 ation in coherent spin-qubit protocols\, semiconductor devices provide a t
 unable architecture in which coherence time\, control bandwidth\, sensor f
 ilter functions\, and readout fidelity can be engineered for narrowband se
 nsing. I will discuss how spectral engineering of spin-qubit control seque
 nces can enhance sensitivity within targeted axion-mass windows while supp
 ressing charge noise\, magnetic noise\, and control-induced backgrounds. P
 articular emphasis will be placed on realistic noise spectra\, quantum-con
 trol filter functions\, weak field sensitivity limits\, and the resulting 
 coupling reach. Beyond sensitivity optimization\, I will show how the moti
 on of the terrestrial laboratory through the Galactic dark-matter halo pro
 duces characteristic sidereal and annual modulation signatures\, leading t
 o structured sideband responses that provide a robust discriminator agains
 t stationary instrumental backgrounds. Finally\, I will outline prospects 
 for hybrid electronic–nuclear spin architectures\, where long-lived nucl
 ear coherence can be combined with fast electronic-spin initialization and
  readout through hyperfine-mediated transduction\, offering a scalable and
  CMOS-compatible route toward chip-integrated weak field sensing\, axion s
 earches\, and broader quantum-enabled dark-matter detection.\n\nhttps://in
 dico.itp.ac.cn/event/416/contributions/2693/
LOCATION:Conference Center (2F) Back Area
URL:https://indico.itp.ac.cn/event/416/contributions/2693/
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