2014/09/30 by Elena Ferraro, E. Ferraro, Marco De Michielis +4 · 1 citation
Computer Science · Physics and Astronomy · #Adiabatic process #Charge qubit #Condensed matter physics #Degenerate energy levels #Dephasing #Phase qubit #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum dot #Quantum error correction #Quantum mechanics #Quantum tunnelling #Qubit #Spin (aerodynamics) #Trapped ion quantum computer #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.91.075435
published as Physical Review B 91, 075435 (2015) · 8 pages
openalex publication_date 2015/02/26 · arxiv created 2015/03/03 · arxiv updated 2018/09/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A scheme based on coherent tunneling by adiabatic passage (CTAP) of exchange-only spin qubit quantum states in a linearly arranged double quantum dot chain is demonstrated. Logical states for the qubit are defined by adopting the spin state of three electrons confined in a double quantum dot. The possibility to obtain gate operations entirely with electrical manipulations makes this qubit a valuable architecture in the field of quantum computing for the implementation of quantum algorithms. The effect of the external control parameters as well as the effect of the dephasing on the coherent tunneling in the chain is studied. During adiabatic transport, within a constant energy degenerate eigenspace, the states in the double quantum dots internal to the chain are not populated, while transient populations of the mixed states in the external ones are predicted.