Non-adiabatic charge state transitions in singlet-triplet qubits
arXiv:1309.6889 · doi:10.1088/1367-2630/15/10/103015
Abstract
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.
References in corpus (9)
- Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
- Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
- Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
- Spin-echo of a single electron spin in a quantum dot
- Universal set of quantum gates for double-dot spin qubits with fixed interdot coupling
- Conditional operation of a spin qubit
- Quantum gates between capacitively coupled double quantum dot two-spin qubits
- Controllable exchange coupling between two singlet-triplet qubits
- Y-junction splitting spin states of moving quantum dot