Pulse sequences for suppressing leakage in single-qubit gate operations

Abstract

Many realizations of solid-state qubits involve couplings to leakage states lying outside the computational subspace, posing a threat to high-fidelity quantum gate operations. Mitigating leakage errors is especially challenging when the coupling strength is unknown, e.g., when it is caused by noise. Here we show that simple pulse sequences can be used to strongly suppress leakage errors for a qubit embedded in a three-level system. As an example, we apply our scheme to the recently proposed charge quadrupole (CQ) qubit for quantum dots. These results provide a solution to a key challenge for fault-tolerant quantum computing with solid-state elements.

5 pages, 2 figures, Supplemental material attached

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Cited by in corpus (14)

• Achieving High-Fidelity Single-Qubit Gates in a Strongly Driven Charge Qubit with $1/f$ Charge Noise
• A decoherence-free subspace in a charge quadrupole qubit
• Strong photon coupling to the quadrupole moment of an electron in solid state
• CMOS Position-Based Charge Qubits: Theoretical Analysis of Control and Entanglement
• Robust population inversion in three-level systems by composite pulses
• Composite pulses for high fidelity population transfer in three-level systems
• Suppression of leakage for a charge quadrupole qubit in triangular geometry
• Universal Barenco quantum gates via a tunable non-collinear interaction
• Coupling two charge qubits via a superconducting resonator operating in the resonant and dispersive regimes
• Fast high-fidelity geometric gates for singlet-triplet qubits
• Alibaba Cloud Quantum Development Platform: Surface Code Simulations with Crosstalk
• Phonon-induced decoherence of a charge quadrupole qubit
• Three-state coherent control using narrowband and passband sequences
• Leakage suppression by ultrafast pulse shaping