Non-adiabatic charge state transitions in singlet-triplet qubits

In double quantum dot singlet-triplet qubits, the exchange interaction is used in both quantum gate operation and the measurement of the state of the qubit. The exchange can be controlled electronically by applying gate voltage pulses. We simulate the exchange induced charge state transitions in one...

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Bibliographic Details
Published inNew journal of physics Vol. 15; no. 10; pp. 103015 - 13
Main Authors Hiltunen, Tuukka, Ritala, Juha, Siro, Topi, Harju, Ari
Format Journal Article
LanguageEnglish
Published IOP Publishing 17.10.2013
Subjects
Charge
Coulomb friction
Error analysis
Exchange
Gates
Leakage
Qubits (quantum computing)
Simulation
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Summary:In double quantum dot singlet-triplet qubits, the exchange interaction is used in both quantum gate operation and the measurement of the state of the qubit. The exchange can be controlled electronically by applying gate voltage pulses. We simulate the exchange induced charge state transitions in one and two singlet-triplet qubit systems using the exact diagonalization method. We find that fast detuning pulses may result in leakage between different singlet charge states. The leakage could cause measurement errors and hinder quantum gate operation for example in the case of the two-qubit Coulomb gate.
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ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/15/10/103015