Entanglement generation via power-of-SWAP operations between dynamic electron-spin qubits

Abstract

Surface acoustic waves (SAWs) can create moving quantum dots in piezoelectric materials. Here we show how electron-spin qubits located on dynamic quantum dots can be entangled. Previous theoretical and numerical models of quantum-dot entanglement generation have been insufficient to study quantum dynamics in realistic experimental devices. We utilize state-of-the-art graphics processing units to simulate the wave function dynamics of two electrons carried by a SAW through a 2D semiconductor heterostructure. We build a methodology to implement a power-of-SWAP gate via the Coulomb interaction. A benefit of the SAW architecture is that it provides a coherent way of transporting the qubits through an electrostatic potential. This architecture allows us to avoid problems associated with fast control pulses and guarantees operation consistency, providing an advantage over static qubits. For inter-dot barrier heights where the double occupation energy is sufficiently greater than the double-dot hopping energy, we find that parameters based on experiments in GaAs/AlGaAs heterostructures can produce a high-fidelity root-of-SWAP operation. Our results provide a methodology for a crucial component of dynamic-qubit quantum computing.

References in corpus (20)

• Quantum Computation with Quantum Dots
• Coupled quantum dots as quantum gates
• Universal Quantum Computation with the Exchange Interaction
• Electrons surfing on a sound wave as a platform for quantum optics with flying electrons
• On-demand single-electron transfer between distant quantum dots
• Universal Quantum Transducers based on Surface Acoustic Waves
• Two-qubit Gate of Combined Single Spin Rotation and Inter-dot Spin Exchange in a Double Quantum Dot
• Quantum computation using electrons trapped by surface acoustic waves
• Mesoscopic spin confinement during acoustically induced transport
• Coherent spin state transfer via Heisenberg exchange
• Sound-driven single-electron transfer in a circuit of coupled quantum rails
• Spin of a multielectron quantum dot and its interaction with a neighboring electron
• Single-qubit gates and measurements in the surface acoustic wave quantum computer
• Transporting and manipulating single electrons in surface-acoustic-wave minima
• Surface Acoustic Wave Single-Electron Interferometry
• Quantum teleportation of electrons in quantum wires with surface acoustic waves
• Two-Particle Schroedinger Equation Animations of Wavepacket-Wavepacket Scattering (revised)
• Non-universal transmission phase behaviour of a large quantum dot
• Protocol for Fermionic Positive-Operator-Valued Measures
• Generation of EPR pairs and interconversion of static and flying electron spin qubits

Cited by in corpus (6)

• Efficient quantum circuits for quantum computational chemistry
• Coulomb-mediated antibunching of an electron pair surfing on sound
• In-flight distribution of an electron within a surface acoustic wave
• Synthesizing efficient circuits for Hamiltonian simulation
• Two-electron selective coupling in an edge-state based conditional phase shifter
• Charge qubits based on ultra-thin topological insulator films