Tunable Spin Qubit Coupling Mediated by a Multi-Electron Quantum Dot

Abstract

We present an approach for entangling electron spin qubits localized on spatially separated impurity atoms or quantum dots via a multi-electron, two-level quantum dot. The effective exchange interaction mediated by the dot can be understood as the simplest manifestation of Ruderman-Kittel-Kasuya-Yosida exchange, and can be manipulated through gate voltage control of level splittings and tunneling amplitudes within the system. This provides both a high degree of tuneability and a means for realizing high-fidelity two-qubit gates between spatially separated spins, yielding an experimentally accessible method of coupling donor electron spins in silicon via a hybrid impurity-dot system.

6 pages, 3 figures

References in corpus (14)

• An addressable quantum dot qubit with fault-tolerant control fidelity
• Storing quantum information for 30 seconds in a nanoelectronic device
• Circuit Quantum Electrodynamics with a Spin Qubit
• Solid state quantum memory using the 31P nuclear spin
• Spin qubits with electrically gated polyoxometalate molecules
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Ultra-long distance interaction between spin qubits
• Quantum Decoherence of the Central Spin in a Sparse System of Dipolar Coupled Spins
• Efficient multiqubit entanglement via a spin-bus
• Single-shot readout and relaxation of singlet/triplet states in exchange-coupled ${}^{31}$P electron spins in silicon
• Robust two-qubit gates for donors in silicon controlled by hyperfine interactions
• Even-Odd Effects of Heisenberg Chains on Long-range Interaction and Entanglement
• Indirect Exchange Interaction between two Quantum Dots in an Aharonov-Bohm Ring
• Spin Qubits in Multi-Electron Quantum Dots

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