Quantum gates between capacitively coupled double quantum dot two-spin qubits

Abstract

We study the two-qubit controlled-not gate operating on qubits encoded in the spin state of a pair of electrons in a double quantum dot. We assume that the electrons can tunnel between the two quantum dots encoding a single qubit, while tunneling between the quantum dots that belong to different qubits is forbidden. Therefore, the two qubits interact exclusively through the direct Coulomb repulsion of the electrons. We find that entangling two-qubit gates can be performed by the electrical biasing of quantum dots and/or tuning of the tunneling matrix elements between the quantum dots within the qubits. The entangling interaction can be controlled by tuning the bias through the resonance between the singly-occupied and doubly-occupied singlet ground states of a double quantum dot.

12 pages, 7 figures

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Cited by in corpus (38)

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• One-step preparation of cluster states in quantum dot molecules
• Harnessing the GaAs quantum dot nuclear spin bath for quantum control
• Controllable exchange coupling between two singlet-triplet qubits
• Hybrid spin and valley quantum computing with singlet-triplet qubits
• The asymmetric resonant exchange qubit under the influence of electrical noise
• Electrically controlled quantum gates for two-spin qubits in two double quantum dots
• Entangling Spins in Double Quantum Dots and Majorana Bound States
• Six-electron semiconductor double quantum dot qubits
• Dispersive Coupling Between the Superconducting Transmission Line Resonator and the Double Quantum Dots
• Long-range entanglement for spin qubits via quantum Hall edge modes
• Configuration interaction calculations of the controlled phase gate in double quantum dot qubits
• Directly accessible entangling gates for capacitively coupled singlet-triplet qubits
• Capacitively coupled singlet-triplet qubits in the double charge resonant regime
• Exact CNOT Gates with a Single Nonlocal Rotation for Quantum-Dot Qubits
• Quantum Computation and Bell-state Measurement with Double-Dot Molecules
• Programmable two-qubit gates in capacitively coupled flopping-mode spin qubits
• Charge-noise tolerant exchange gates of singlet-triplet qubits in asymmetric double quantum dots
• Low-noise conditional operation of singlet-triplet coupled quantum dot qubits
• Capacitative coupling of singlet-triplet qubits in different inter-qubit geometries
• Tunable charge qubit based on barrier-controlled triple quantum dots
• Charge noise suppression in capacitively coupled singlet-triplet spin qubits under magnetic field
• Maximal tripartite entanglement between singlet-triplet qubits in quantum dots
• Simulation of Coupling Strength of Capacitively Coupled Singlet-Triplet Qubits
• A robust operating point for capacitively coupled singlet-triplet qubits
• Energy spectrum, exchange interaction and gate crosstalk in a pair of double-quantum-dot system: a molecular orbital calculation
• Nonmonotonic buildup of spin-singlet correlations in a double quantum dot
• Robust entangling gate for capacitively coupled few-electron singlet-triplet qubits
• Eliminating interactions between non-neighboring qubits in the preparation of cluster states in quantum molecules
• Non-adiabatic charge state transitions in singlet-triplet qubits
• Rapid adiabatic gating for capacitively coupled quantum dot hybrid qubits without barrier control
• General quantum phase estimation and calibration of a timepiece in a quantum dot system
• Discrete quantum Fourier transform in coupled semiconductor double quantum dot molecules