Mitigation of quantum crosstalk in cross-resonance based qubit architectures

• URL: http://arxiv.org/abs/2307.09995v2
• Date: Sun, 12 Nov 2023 13:01:33 GMT
• Title: Mitigation of quantum crosstalk in cross-resonance based qubit architectures
• Authors: Peng Zhao
• Abstract summary: We introduce a CR gate-based transmon architecture with passive mitigation of both quantum crosstalk and frequency collisions. We show that ZZ crosstalk can be suppressed while maintaining XY couplings to support fast, high-fidelity CR gates. This work could be useful for suppressing quantum crosstalk and improving gate fidelities in large-scale quantum processors.
• Score: 8.23558342809427
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The Cross-resonance (CR) gate architecture that exploits fixed-frequency transmon qubits and fixed couplings is a leading candidate for quantum computing. Nonetheless, without the tunability of qubit parameters such as qubit frequencies and couplings, gate operations can be limited by the presence of quantum crosstalk arising from the always-on couplings. When increasing system sizes, this can become even more serious considering frequency collisions caused by fabrication uncertainties. Here, we introduce a CR gate-based transmon architecture with passive mitigation of both quantum crosstalk and frequency collisions. Assuming typical parameters, we show that ZZ crosstalk can be suppressed while maintaining XY couplings to support fast, high-fidelity CR gates. The architecture also allows one to go beyond the existing literature by extending the operating regions in which fast, high-fidelity CR gates are possible, thus alleviating the frequency-collision issue. To examine the practicality, we analyze the CR gate performance in multiqubit lattices and provide an intuitive model for identifying and mitigating the dominant source of error. For the state-of-the-art precision in setting frequencies, we further investigate its impact on the gates. We find that ZZ crosstalk and frequency collisions can be largely mitigated for neighboring qubits, while interactions beyond near neighbor qubits can introduce new frequency collisions. As the strength is typically at the sub-MHz level, adding weak off-resonant drives to selectively shift qubits can mitigate the collisions. This work could be useful for suppressing quantum crosstalk and improving gate fidelities in large-scale quantum processors based on fixed-frequency qubits and fixed couplings.

Related papers

• QuantumSEA: In-Time Sparse Exploration for Noise Adaptive Quantum Circuits [82.50620782471485]
  QuantumSEA is an in-time sparse exploration for noise-adaptive quantum circuits. It aims to achieve two key objectives: (1) implicit circuits capacity during training and (2) noise robustness. Our method establishes state-of-the-art results with only half the number of quantum gates and 2x time saving of circuit executions.
  arXiv  Detail & Related papers  (2024-01-10T22:33:00Z)
• Fast ZZ-Free Entangling Gates for Superconducting Qubits Assisted by a Driven Resonator [42.152052307404]
  We propose a simple scheme to cancel stray interactions between qubits. We numerically show that such a scheme can enable short and high-fidelity entangling gates. Our architecture is not only ZZ free but also contains no extra noisy components.
  arXiv  Detail & Related papers  (2023-11-02T15:42:02Z)
• Mitigating crosstalk errors by randomized compiling: Simulation of the BCS model on a superconducting quantum computer [41.94295877935867]
  Crosstalk errors, stemming from CNOT two-qubit gates, are a crucial source of errors on numerous quantum computing platforms. We develop and apply an extension of the randomized compiling protocol that includes a special treatment of neighboring qubits. Our twirling of neighboring qubits is shown to dramatically improve the noise estimation protocol without the need to add new qubits or circuits.
  arXiv  Detail & Related papers  (2023-05-03T18:00:02Z)
• Quantum process tomography of continuous-variable gates using coherent states [49.299443295581064]
  We demonstrate the use of coherent-state quantum process tomography (csQPT) for a bosonic-mode superconducting circuit. We show results for this method by characterizing a logical quantum gate constructed using displacement and SNAP operations on an encoded qubit.
  arXiv  Detail & Related papers  (2023-03-02T18:08:08Z)
• Extensible circuit-QED architecture via amplitude- and frequency-variable microwaves [52.77024349608834]
  We introduce a circuit-QED architecture combining fixed-frequency qubits and microwave-driven couplers. Drive parameters appear as tunable knobs enabling selective two-qubit coupling and coherent-error suppression.
  arXiv  Detail & Related papers  (2022-04-17T22:49:56Z)
• Scalable High-Performance Fluxonium Quantum Processor [0.0]
  We propose a superconducting quantum information processor based on compact high-coherence fluxoniums with suppressed crosstalk. We numerically investigate the cross resonance controlled-NOT and the differential AC-Stark controlled-Z operations, revealing low gate error for qubit-qubit detuning bandwidth of up to 1 GHz.
  arXiv  Detail & Related papers  (2022-01-23T21:49:04Z)
• Coherent effects contribution to a fast gate fidelity in ion quantum computer [47.187609203210705]
  We develop a numerical model for full simulation of coherence effects using a linear ion microtrap array and a 2D microtrap array. We have also studied the dependency of the gate fidelity on the laser power fluctuations.
  arXiv  Detail & Related papers  (2021-12-12T12:53:00Z)
• Quantum crosstalk analysis for simultaneous gate operations on superconducting qubits [12.776712619117092]
  We study the impact of quantum crosstalk on simultaneous gate operations in a qubit architecture. Our analysis shows that for microwave-driven single-qubit gates, the dressing from the qubit-qubit coupling can cause non-negligible cross-driving errors.
  arXiv  Detail & Related papers  (2021-10-25T01:21:04Z)
• Suppression of crosstalk in superconducting qubits using dynamical decoupling [0.0]
  Super superconducting quantum processors with interconnected transmon qubits are noisy and prone to various errors. ZZ-coupling between qubits in fixed frequency transmon architectures is always present and contributes to both coherent and incoherent crosstalk errors. We propose the use of dynamical decoupling to suppress the crosstalk, and demonstrate the success of this scheme through experiments on several IBM quantum cloud processors.
  arXiv  Detail & Related papers  (2021-08-10T09:16:05Z)
• Systematic Crosstalk Mitigation for Superconducting Qubits via Frequency-Aware Compilation [3.2460743209388094]
  One of the key challenges in current Noisy Intermediate-Scale Quantum (NISQ) computers is to control a quantum system with high-fidelity quantum gates. We motivate a systematic approach for understanding and mitigating the crosstalk noise when executing near-term quantum programs on superconducting NISQ computers. We present a general software solution to alleviate frequency crowding by systematically tuning qubit frequencies according to input programs.
  arXiv  Detail & Related papers  (2020-08-21T14:35:38Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.