Controllable exchange coupling between two singlet-triplet qubits

Abstract

We study controllable exchange coupling between two singlet-triplet qubits. We start from the original second quantized Hamiltonian of a quadruple quantum dot system and obtain the effective spin-spin interaction between the two qubits using the projection operator method. Under a strong uniform external magnetic field and an inhomogeneous local micro-magnetic field, the effective interqubit coupling is of the Ising type, and the coupling strength can be expressed in terms of quantum dot parameters. Finally, we discuss how to generate various two-qubit operations using this controllable coupling, such as entanglement generation, and controlled-NOT gate.

9 pages, 3 figures

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• Crosstalk error correction through dynamical decoupling of single-qubit gates in capacitively coupled singlet-triplet semiconductor spin qubits
• Probing resonating valence bonds on a programmable germanium quantum simulator
• High-fidelity gate set for exchange-coupled singlet-triplet qubits
• Hyperfine interaction induced dephasing of coupled spin qubits in semiconductor double quantum dots
• High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits
• Directly accessible entangling gates for capacitively coupled singlet-triplet qubits
• Floquet-Enhanced Spin Swaps
• Capacitively coupled singlet-triplet qubits in the double charge resonant regime
• Effective Hamiltonian for two interacting double-dot exchange-only qubits and their controlled-NOT operations
• Device Architecture for Coupling Spin Qubits Via an Intermediate Quantum State
• Anisotropic exchange coupling in a nanowire double quantum dot with strong spin-orbit coupling
• Charge-noise tolerant exchange gates of singlet-triplet qubits in asymmetric double quantum dots
• Suppression of charge noise using barrier control of a singlet-triplet qubit
• Error correction for gate operations in systems of exchange-coupled singlet-triplet qubits in double quantum dots
• Gate fidelity comparison in semiconducting spin qubit implementations affected by control noises
• Coherence time analysis in semiconducting hybrid qubit under realistic experimental conditions
• Fast high-fidelity geometric gates for singlet-triplet qubits
• Charge noise suppression in capacitively coupled singlet-triplet spin qubits under magnetic field
• Magic angle for barrier-controlled double quantum dots
• Semiconducting double-dot exchange-only qubit dynamics in presence of magnetic and charge noises
• Dynamical second-order noise sweetspots in resonantly driven spin qubits
• Hybrid Exchange Measurement-Based Qubit Operations in Semiconductor Double Quantum Dot Qubits
• Energy spectrum, exchange interaction and gate crosstalk in a pair of double-quantum-dot system: a molecular orbital calculation
• Robust entangling gate for capacitively coupled few-electron singlet-triplet qubits
• Quantum simulation of topological Majorana bound states and their universal quantum operations using charge-qubit arrays
• Universal control of superexchange in linear triple quantum dots with an empty mediator
• Hyperfine interaction mediated electric-dipole spin resonance: the role of frequency modulation
• Sign-switching of superexchange mediated by few electrons under non-uniform magnetic field
• Non-adiabatic charge state transitions in singlet-triplet qubits
• Quantum gates in coupled quantum dots controlled by coupling modulation
• Limitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dots