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 (21)
- Quantum entanglement
- Quantum Computation with Quantum Dots
- Spins in few-electron quantum dots
- Electron spin relaxation by nuclei in semiconductor quantum dots
- Electron spin decoherence in quantum dots due to interaction with nuclei
- Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
- Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field
- Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
- Universal quantum computation with spin-1/2 pairs and Heisenberg exchange
- Relaxation, dephasing, and quantum control of electron spins in double quantum dots
- Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
- Rapid Single-Shot Measurement of a Singlet-Triplet Qubit
- A coherent beam splitter for electronic spin states
- 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
- Vortices in quantum droplets: Analogies between boson and fermion systems
- Conditional operation of a spin qubit
- Quantum gates between capacitively coupled double quantum dot two-spin qubits
- Implications of Simultaneous Requirements for Low Noise Exchange Gates in Double Quantum Dots
- Controllable exchange coupling between two singlet-triplet qubits
- Y-junction splitting spin states of moving quantum dot