Coherent transfer of quantum information in silicon using resonant SWAP gates

Abstract

Solid state quantum processors based on spins in silicon quantum dots are emerging as a powerful platform for quantum information processing. High fidelity single- and two-qubit gates have recently been demonstrated and large extendable qubit arrays are now routinely fabricated. However, two-qubit gates are mediated through nearest-neighbor exchange interactions, which require direct wavefunction overlap. This limits the overall connectivity of these devices and is a major hurdle to realizing error correction, quantum random access memory, and multi-qubit quantum algorithms. To extend the connectivity, qubits can be shuttled around a device using quantum SWAP gates, but phase coherent SWAPs have not yet been realized in silicon devices. Here, we demonstrate a new single-step resonant SWAP gate. We first use the gate to efficiently initialize and readout our double quantum dot. We then show that the gate can move spin eigenstates in 100 ns with average fidelity ${\bar{F}}_{SWAP}^p$ = 98%. Finally, the transfer of arbitrary two-qubit product states is benchmarked using state tomography and Clifford randomized benchmarking, yielding an average fidelity of ${\bar{F}}_{SWAP}^c$ = 84% for gate operation times of ~300 ns. Through coherent spin transport, our resonant SWAP gate enables the coupling of non-adjacent qubits, thus paving the way to large scale experiments using silicon spin qubits.

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Cited by in corpus (59)

• Semiconductor Spin Qubits
• Fast universal quantum control above the fault-tolerance threshold in silicon
• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• Coherent spin qubit transport in silicon
• Quantum tomography of an entangled three-spin state in silicon
• Coherent spin state transfer via Heisenberg exchange
• A shuttling-based two-qubit logic gate for linking distant silicon quantum processors
• Single-spin qubits in isotopically enriched silicon at low magnetic field
• Adiabatic quantum state transfer in a semiconductor quantum-dot spin chain
• Spin readout of a CMOS quantum dot by gate reflectometry and spin-dependent tunnelling
• Beating the Standard Quantum Limit under Ambient Conditions with Solid-State Spins
• Shuttling an electron spin through a silicon quantum dot array
• Spin shuttling in a silicon double quantum dot
• First-principles hyperfine tensors for electrons and holes in GaAs and silicon
• High-fidelity geometric gate for silicon-based spin qubits
• Simulated coherent electron shuttling in silicon quantum dots
• Adiabatic electron charge transfer between two quantum dots in presence of 1/f noise
• Enhanced quantum state transfer: Circumventing quantum chaotic behavior
• Conditional Teleportation of Quantum-Dot Spin States
• Bounds to electron spin qubit variability for scalable CMOS architectures
• Floquet-Enhanced Spin Swaps
• Strategies for enhancing spin-shuttling fidelities in Si/SiGe quantum wells with random-alloy disorder
• Fast Bayesian tomography of a two-qubit gate set in silicon
• Coherent transport of spin by adiabatic passage in quantum dot arrays
• Electron cascade for spin readout
• Impacts of Noise and Structure on Quantum Information Encoded in a Quantum Memory
• Cavity-mediated entanglement of parametrically driven spin qubits via sidebands
• Spin-Valley Qubit Dynamics In Exchange Coupled Silicon Quantum Dots
• Protecting Quantum Information in Quantum Dot Spin Chains by Driving Exchange Interactions Periodically
• Robust photon-mediated entangling gates between quantum dot spin qubits
• Optimal control of a cavity-mediated iSWAP gate between silicon spin qubits
• Flopping-mode electron dipole spin resonance in the strong-driving regime
• Devitalizing noise-driven instability of entangling logic in silicon devices with bias controls
• Continuous microwave photon counting by semiconductor-superconductor hybrids
• Control of dephasing in spin qubits during coherent transport in silicon
• Entangling gates on degenerate spin qubits dressed by a global field
• Compact spin qubits using the common gate structure of fin field-effect transistors
• Designing arbitrary single-axis rotations robust against perpendicular time-dependent noise
• Characterization and tomography of a hidden qubit
• Fidelity of a sequence of SWAP operations on a spin chain
• Exact analytical treatment of multiqubit noisy dynamics in exchange-coupled semiconductor spin qubits
• Long-range two-hybrid-qubit gates mediated by a microwave cavity with red sidebands
• Fault-Tolerant Preparation of Quantum Polar Codes Encoding One Logical Qubit
• Dissipation and gate timing errors in SWAP operations of qubits
• Enhancing strength and range of atom-atom interaction in a coupled-cavity array via parametric drives
• Parallel multi-two-qubit SWAP gate via QND interaction of OAM light and atomic ensemble
• Compiling the surface code to crossbar spin qubit architectures
• Nonadiabatic quantum control of quantum dot arrays with fixed exchange using Cartan decomposition
• Factory-based Fault-tolerant Preparation of Quantum Polar Codes Encoding One logical Qubit
• Probing the Atomic Arrangement of Sub-Surface Dopants in a Silicon Quantum Device Platform
• Radiofrequency cascade readout of coupled spin qubits
• Proposal for a cavity-induced measurement of the exchange coupling in quantum dots
• A SWAP Gate for Spin Qubits in Silicon
• Universal singlet-triplet qubits implemented near the transverse sweet spot
• High-fidelity spin readout via the double latching mechanism
• Highly Tunable Two-Qubit Interactions in Si/SiGe Quantum Dots by Interchanging the Roles of Qubit-Defining Gates
• Charge detection of a quantum dot under different tunneling barrier symmetries and bias voltages
• Robust iSWAP gates for semiconductor spin qubits with local driving
• Influence of errors on the transport of quantum information through distant quantum dot spin qubits