A quadrupolar exchange-only spin qubit

Abstract

We propose a quadrupolar exchange-only spin (QUEX) qubit that is highly robust against charge noise and nuclear spin dephasing, the dominant decoherence mechanisms in quantum dots. The qubit consists of four electrons trapped in three quantum dots, and operates in a decoherence-free subspace to mitigate dephasing due to nuclear spins. To reduce sensitivity to charge noise, the qubit can be completely operated at an extended charge noise sweet spot that is first-order insensitive to electrical fluctuations. Due to on-site exchange mediated by the Coulomb interaction, the qubit energy splitting is electrically controllable and can amount to several GHz even in the ``off" configuration, making it compatible with conventional microwave cavities.

References in corpus (21)

• A Coherent Spin-Photon Interface in Silicon
• Prospects for Spin-Based Quantum Computing
• Strong spin-photon coupling in silicon
• Strong Coupling of a Single Electron in Silicon to a Microwave Photon
• Scalable gate architecture for densely packed semiconductor spin qubits
• Coherent spin manipulation in an exchange-only qubit
• Coherent spin-qubit photon coupling
• Strong Coupling Cavity QED with Gate-Defined Double Quantum Dots Enabled by a High Impedance Resonator
• Using Sideband Transitions for Two-Qubit Operations in Superconducting Circuits
• Ultra-long distance interaction between spin qubits
• Universal set of quantum gates for double-dot spin qubits with fixed interdot coupling
• Sideband Transitions and Two-Tone Spectroscopy of a Superconducting Qubit Strongly Coupled to an On-Chip Cavity
• Physical mechanisms of interface-mediated intervalley coupling in Si
• Dispersive readout of valley splittings in cavity-coupled silicon quantum dots
• Orbital and valley state spectra of a few-electron silicon quantum dot
• Coupling of three-spin qubits to their electric environment
• The asymmetric resonant exchange qubit under the influence of electrical noise
• Decoherence of an exchange qubit by hyperfine interaction
• Two-Qubit Pulse Gate for the Three-Electron Double Quantum Dot Qubit
• Towards hybrid circuit quantum electrodynamics with quantum dots
• Hyperfine-induced dephasing in three-electron spin qubits

Cited by in corpus (29)

• Semiconductor Spin Qubits
• Semiconductor Qubits In Practice
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• Automated tuning of double quantum dots into specific charge states using neural networks
• Colloquium: Advances in automation of quantum dot devices control
• Coherent long-distance spin-qubit-transmon coupling
• Long-Distance Superexchange between Semiconductor Quantum-Dot Electron Spins
• Analog Quantum Simulation of the Dynamics of Open Quantum Systems with Quantum Dots and Microelectronic Circuits
• Strong photon coupling to the quadrupole moment of an electron in solid state
• Coherent multi-spin exchange coupling in a quantum-dot spin chain
• Hybrid superconductor-semiconductor systems for quantum technology
• Resonant Exchange Operation in Triple-Quantum-Dot Qubits for Spin-Photon Transduction
• Realization of a $C{Q}_3$ Qubit: energy spectroscopy and coherence
• Highly tunable exchange-only singlet-only qubit in a GaAs triple quantum dot
• Theory of valley-resolved spectroscopy of a Si triple quantum dot coupled to a microwave resonator
• Democratizing Spin Qubits
• Protected Solid-State Qubits
• Charge states, triple points and quadruple points in an InAs nanowire triple quantum dot revealed by an integrated charge sensor
• Exact analytical treatment of multiqubit noisy dynamics in exchange-coupled semiconductor spin qubits
• Readout using Resonant Tunneling in Silicon Spin Qubits
• Proposal for a cavity-induced measurement of the exchange coupling in quantum dots
• Universal control of superexchange in linear triple quantum dots with an empty mediator
• Singlet-only Always-on Gapless Exchange Qubits with Baseband Control
• Transport-induced suppression of nuclear field fluctuations in multi-quantum-dot systems
• Effects of valley splitting on resonant-tunneling readout of spin qubits
• Limitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dots
• Jenga-Krotov algorithm: Efficient compilation of multi-qubit gates for exchange-only qubits
• Qubit decoherence under two-axis coupling to low-frequency noises