Floquet-Enhanced Spin Swaps

Abstract

The transfer of information between quantum systems is essential for quantum communication and computation. In quantum computers, high connectivity between qubits can improve the efficiency of algorithms, assist in error correction, and enable high-fidelity readout. However, as with all quantum gates, operations to transfer information between qubits can suffer from errors associated with spurious interactions and disorder between qubits, among other things. Here, we harness interactions and disorder between qubits to improve a swap operation for spin eigenstates in semiconductor gate-defined quantum-dot spins. We use a system of four electron spins, which we configure as two exchange-coupled singlet-triplet qubits. Our approach, which relies on the physics underlying discrete time crystals, enhances the quality factor of spin-eigenstate swaps by up to an order of magnitude. Our results show how interactions and disorder in multi-qubit systems can stabilize non-trivial quantum operations and suggest potential uses for non-equilibrium quantum phenomena, like time crystals, in quantum information processing applications. Our results also confirm the long-predicted emergence of effective Ising interactions between exchange-coupled singlet-triplet qubits.

v2: 11+2 pages, 5+3 figures

References in corpus (12)

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• Exchange-based two-qubit gate for singlet-triplet qubits
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• Discrete time crystal in the gradient field Heisenberg model

Cited by in corpus (12)

• Semiconductor Spin Qubits
• Signatures of discrete time-crystallinity in transport through an open Fermionic chain
• Emergence and Dynamical Stability of Charge Time-Crystal in a Current-Carrying Quantum Dot Simulator
• Protecting Quantum Information in Quantum Dot Spin Chains by Driving Exchange Interactions Periodically
• Large-scale simulations of Floquet physics on near-term quantum computers
• Non-adiabatic single-electron pump in a dopant-free GaAs/AlGaAs 2DEG
• Single spin Landau-Zener-Stückelberg-Majorana interferometry of Zeeman-split states with strong spin-orbit interaction in a double quantum dot
• Time-crystalline behavior in central-spin models with Heisenberg interactions
• Dynamical second-order noise sweetspots in resonantly driven spin qubits
• Protecting coherence from the environment via Stark many-body localization in a Quantum-Dot Simulator
• Time Crystals from single-molecule magnet arrays
• Optimization of Floquet fluxonium qubits with commensurable two-tone drives