Dynamics of interacting transport qubits
arXiv:1204.2978 · doi:10.1103/PhysRevB.85.245431
Abstract
We investigate the electronic transport through two parallel double quantum dots coupled both capacitively and via a perpendicularly aligned charge qubit. The presence of the qubit leads to a modification of the coherent tunnel amplitudes of each double quantum dot. We study the influence of the qubit on the electronic steady state currents through the system, the entanglement between the transport double quantum dots, and the back action on the charge qubit. We use a Born-Markov-Secular quantum master equation for the system. The obtained currents show signatures of the qubit. The stationary qubit state may be tuned and even rendered pure by applying suitable voltages. In the Coulomb diamonds it is also possible to stabilize pure entangled states of the transport double quantum dots.
References in corpus (25)
- Entanglement of Formation of an Arbitrary State of Two Qubits
- Quantum Computation with Quantum Dots
- The Physical Implementation of Quantum Computation
- Electron transport through double quantum dots
- Manipulating the Quantum State of an Electrical Circuit
- Driven coherent oscillations of a single electron spin in a quantum dot
- Few-Electron Quantum Dot Circuit with Integrated Charge Read-Out
- Quantum Coherence in a One-Electron Semiconductor Charge Qubit
- Rapid Single-Shot Measurement of a Singlet-Triplet Qubit
- Positive cross-correlations due to Dynamical Channel-Blockade in a three-terminal quantum dot
- Parity meter for charge qubits: an efficient quantum entangler
- Quantum router based on ac control of qubit chains
- Transport Statistics of Interacting Double Dot Systems: Coherent and Non-Markovian Effects
- Nonadiabatic quantum control of a semiconductor charge qubit
- Entanglement Energetics at Zero Temperature
- Screening of charged impurities with multi-electron singlet-triplet spin qubits in quantum dots
- Impurity effects on semiconductor quantum bits in coupled quantum dots
- Coherence stabilization of a two-qubit gate by AC fields
- Intrinsic phonon decoherence and quantum gates in coupled lateral quantum dot charge qubits
- A low-dimensional detector model for full counting statistics: Trajectories, Back-Action, and Fidelity
- Measuring the Entanglement between Double Quantum Dot Charge Qubits
- Quantum Equilibration under Constraints and Transport Balance
- Phase readout of a charge qubit capacitively coupled to an open double quantum dot
- Monitoring Entanglement Evolution and Collective Quantum Dynamics
- Entanglement detection via condition of quantum correlation
Cited by in corpus (5)
- Non-local transport properties of nanoscale conductor-microwave cavity systems
- Nonequilibrium relaxation transport of ultracold atoms
- Transport with ultracold atoms at constant density
- Channel Blockade in a Two-Path Triple-Quantum-Dot System
- Coherent quantum ratchets driven by tunnel oscillations: Fluctuations and correlations