Simulation of Coupling Strength of Capacitively Coupled Singlet-Triplet Qubits

Abstract

We consider a system of two purely capacitively-coupled singlet-triplet qubits, and numerically simulate the energy structure of four electrons in two double quantum dots with a large potential barrier between them. We calculate the interqubit coupling strength using an extended Hund-Mulliken approach which includes excited orbitals in addition to the lowest energy orbital for each quantum dot. We show the coupling strength as a function of the qubit separation, as well as plotting it against the detunings of the two double quantum dots, and show that the general qualitative features of our results can be captured by a potential-independent toy model of the system.

9 pages, 6 figures

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Cited by in corpus (5)

• Quantum simulation of antiferromagnetic Heisenberg chain with gate-defined quantum dots
• Protecting Quantum Information in Quantum Dot Spin Chains by Driving Exchange Interactions Periodically
• Probing two-qubit capacitive interactions beyond bilinear regime using dual Hamiltonian parameter estimations
• Charge noise suppression in capacitively coupled singlet-triplet spin qubits under magnetic field
• Robust entangling gate for capacitively coupled few-electron singlet-triplet qubits