Long distance coupling of resonant exchange qubits

Abstract

We investigate the effectiveness of a microwave cavity as a mediator of interactions between two resonant exchange (RX) qubits in semiconductor quantum dots (QDs) over long distances, limited only by the extension of the cavity. Our interaction model includes the orthonormalized Wannier orbitals constructed from Fock-Darwin states under the assumption of a harmonic QD confinement potential. We calculate the qubit-cavity coupling strength in a Jaynes Cummings Hamiltonian, and find that dipole transitions between two states with an asymmetric charge configuration constitute the relevant RX quoit-cavity coupling mechanism. The effective coupling between two RX qubits in a shared cavity yields a universal two-qubit iSWAP-gate with gate times on the order of nanoseconds over distances on the order of up to a millimeter.

revised v2: 13 pages (including 5 appendices), 9 figures

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• A Two Qubit Logic Gate in Silicon
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• Circuit Quantum Electrodynamics Architecture for Gate-Defined Quantum Dots in Silicon
• Cavity QED with hybrid nanocircuits: from atomic-like physics to condensed matter phenomena
• Coupling a single electron spin to a microwave resonator: Controlling transverse and longitudinal couplings
• Strong coupling between an electron in a quantum dot circuit and a photon in a cavity
• Entangling distant resonant exchange qubits via circuit quantum electrodynamics
• Coupling of three-spin qubits to their electric environment
• Symmetric Operation of the Resonant Exchange Qubit
• A quadrupolar exchange-only spin qubit
• Spin of a multielectron quantum dot and its interaction with a neighboring electron
• Hybrid superconductor-semiconductor systems for quantum technology
• Long-range entanglement for spin qubits via quantum Hall edge modes
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• Resonant Exchange Operation in Triple-Quantum-Dot Qubits for Spin-Photon Transduction
• Modulated longitudinal gates on encoded spin-qubits via curvature couplings to a superconducting cavity
• Highly tunable exchange-only singlet-only qubit in a GaAs triple quantum dot
• Cavity-mediated entanglement of parametrically driven spin qubits via sidebands
• Noise suppression and long-range exchange coupling for gallium arsenide spin qubits
• All-electric single electron spin-to-charge conversion
• Entanglement between distant atoms mediated by a hybrid quantum system consisting of superconducting flux qubit and resonators
• Back-action effects in cavity-coupled quantum conductors