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SUMMARY:A Spin Quintet in a Silicon Double Quantum Dot - Theodor Lundberg\
 , Hitachi Ltd
DTSTART:20201127T110000Z
DTEND:20201127T120000Z
UID:TALK151279@talks.cam.ac.uk
CONTACT:40340
DESCRIPTION:Spins in gate-defined silicon quantum dots are promising candi
 dates for implementing large-scale quantum computing. To read the spin sta
 te of these qubits\, the mechanism that has provided highest fidelity is s
 pin-to-charge conversion via singlet-triplet spin blockade\, which can be 
 detected in-situ using gate-based dispersive sensing. In systems with a co
 mplex energy spectrum such as silicon quantum dots\, accurately identifyin
 g when singlet-triplet blockade occurs is therefore critical for scalable 
 qubit readout. \n\nIn this work\, we present a description of spin blockad
 e physics in a tunnel-coupled silicon double quantum dot defined in the co
 rners of a split-gate transistor. Using gate-based magnetospectroscopy\, w
 e report successive steps of spin blockade and spin blockade lifting invol
 ving spin states with total spin angular momentum up to S = 3. Furthermore
 \, we report the formation of a hybridized spin quintet state and show tri
 plet-quintet and quintet-septet spin blockade. This enables investigation 
 of the quintet relaxation dynamics from which we find a relaxation time of
  T1 ~ 4 µs. Finally\, we develop a quantum capacitance model that is appl
 ied generally to reconstruct the energy spectrum of the double quantum dot
  including the spin-dependent tunnel coupling and the energy splitting bet
 ween different spin manifolds. Our results open the possibility of using s
 ilicon complementary metal-oxide-semiconductor (CMOS) quantum dots as a tu
 neable platform for studying the interactions and dynamics of high-spin sy
 stems.\n\nReferences\n\n1) https://arxiv.org/abs/1910.10118 \n\nZoom Link\
 n\nPlease click the link below to join the webinar:\nhttps://us02web.zoom.
 us/j/86846521451?pwd=M0VUSE5wTEJwSndCbEx0VUtqNHpuZz09\nPasscode: 226745\n
LOCATION:Virtually\, at Zoom
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