Circuit-based leakage-to-erasure conversion in a neutral atom quantum processor

• URL: http://arxiv.org/abs/2405.10434v2
• Date: Wed, 10 Jul 2024 01:59:37 GMT
• Title: Circuit-based leakage-to-erasure conversion in a neutral atom quantum processor
• Authors: Matthew N. H. Chow, Vikas Buchemmavari, Sivaprasad Omanakuttan, Bethany J. Little, Saurabh Pandey, Ivan H. Deutsch, Yuan-Yu Jau,
• Abstract summary: Leakage out of the computational subspace is a major limitation of current state-of-the-art neutral-atom quantum computers. We demonstrate circuit-based conversion of leakage errors to erasure errors via Leakage Detection Units (LDUs) We find that the LDU detects atom-loss errors with 93.4% accuracy, limited by technical imperfections of our apparatus.
• Score: 0.5018974919510384
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Leakage out of the computational subspace is a major limitation of current state-of-the-art neutral-atom quantum computers and a significant challenge for scalable systems. In a quantum processor with cesium atoms, we demonstrate proof-of-principle circuit-based conversion of leakage errors to erasure errors via Leakage Detection Units (LDUs), which non-destructively map information about the presence or absence of the qubit onto the state of an ancilla. With a standard LDU circuit, we successfully convert leakage errors to erasure errors for all major leakage pathways while preserving the quantum information in the case that no leakage occurred. We benchmark the performance of the LDU using a three-outcome low-loss state detection method and also explore the advantages of three-outcome measurements for LDUs. We find that the LDU detects atom-loss errors with ~93.4% accuracy, limited by technical imperfections of our apparatus. We further compile and execute a SWAP LDU, wherein the roles of the original data atom and ancilla atom are exchanged under the action of the LDU, providing 'free refilling' of atoms in the case of leakage errors. This circuit-based leakage-to-erasure error conversion is a critical component of a neutral-atom quantum processor where the quantum information may significantly outlive the lifetime of any individual atom in the quantum register.

Related papers

• Quantum Error Correction resilient against Atom Loss [0.0]
  We investigate quantum error correction protocols for neutral atoms quantum processors in the presence of atom loss. For zero depolarizing noise, the atom loss threshold is about $2.6%$.
  arXiv  Detail & Related papers  (2024-12-10T19:00:01Z)
• High-fidelity gates in a transmon using bath engineering for passive leakage reset [65.46249968484794]
  Leakage, the occupation of any state not used in the computation, is one of the most devastating errors in quantum error correction. We demonstrate a device which reduces the lifetimes of the leakage states in the transmon by three orders of magnitude.
  arXiv  Detail & Related papers  (2024-11-06T18:28:49Z)
• Demonstration of Erasure Conversion in a Molecular Tweezer Array [0.0]
  We present work on site-resolved detection of internal state errors and quantum erasures, which are qubit errors with known locations. This enables creating molecular arrays with low defect rates, opening the door to high-fidelity simulation of quantum many-body systems.
  arXiv  Detail & Related papers  (2024-06-04T15:07:24Z)
• Fast Flux-Activated Leakage Reduction for Superconducting Quantum Circuits [84.60542868688235]
  leakage out of the computational subspace arising from the multi-level structure of qubit implementations. We present a resource-efficient universal leakage reduction unit for superconducting qubits using parametric flux modulation. We demonstrate that using the leakage reduction unit in repeated weight-two stabilizer measurements reduces the total number of detected errors in a scalable fashion.
  arXiv  Detail & Related papers  (2023-09-13T16:21:32Z)
• All-microwave leakage reduction units for quantum error correction with superconducting transmon qubits [0.0]
  Minimizing leakage from computational states is a challenge when using superconducting quantum circuits as qubits. We realize and extend the quantum-hardware-efficient, all-microwave leakage reduction unit (LRU) for transmons in a circuit QED architecture proposed by Battistel et al. This LRU effectively reduces leakage in the second- and third-excited transmon states with up to $99% $ efficacy in $220mathrmns$, with minimum impact on the qubit subspace.
  arXiv  Detail & Related papers  (2023-02-20T10:10:53Z)
• Overcoming leakage in scalable quantum error correction [128.39402546769284]
  Leakage of quantum information out of computational states into higher energy states represents a major challenge in the pursuit of quantum error correction (QEC) Here, we demonstrate the execution of a distance-3 surface code and distance-21 bit-flip code on a Sycamore quantum processor where leakage is removed from all qubits in each cycle. We report a ten-fold reduction in steady-state leakage population on the data qubits encoding the logical state and an average leakage population of less than $1 times 10-3$ throughout the entire device.
  arXiv  Detail & Related papers  (2022-11-09T07:54:35Z)
• Error metric for non-trace-preserving quantum operations [3.6492255655113395]
  We study the problem of measuring errors in non-trace-preserving quantum operations. We propose an error metric that efficiently provides an upper bound on the trace distance between the normalized output states.
  arXiv  Detail & Related papers  (2021-10-05T18:54:14Z)
• Fault-tolerant parity readout on a shuttling-based trapped-ion quantum computer [64.47265213752996]
  We experimentally demonstrate a fault-tolerant weight-4 parity check measurement scheme. We achieve a flag-conditioned parity measurement single-shot fidelity of 93.2(2)%. The scheme is an essential building block in a broad class of stabilizer quantum error correction protocols.
  arXiv  Detail & Related papers  (2021-07-13T20:08:04Z)
• Hardware-Efficient, Fault-Tolerant Quantum Computation with Rydberg Atoms [55.41644538483948]
  We provide the first complete characterization of sources of error in a neutral-atom quantum computer. We develop a novel and distinctly efficient method to address the most important errors associated with the decay of atomic qubits to states outside of the computational subspace. Our protocols can be implemented in the near-term using state-of-the-art neutral atom platforms with qubits encoded in both alkali and alkaline-earth atoms.
  arXiv  Detail & Related papers  (2021-05-27T23:29:53Z)
• A hardware-efficient leakage-reduction scheme for quantum error correction with superconducting transmon qubits [1.6328866317851185]
  Leakage outside of the qubit computational subspace poses a threatening challenge to quantum error correction (QEC) We propose a scheme using two leakage-reduction units (LRUs) that mitigate these issues for a transmon-based surface code. We show that this leads to a significant reduction of the logical error rate.
  arXiv  Detail & Related papers  (2021-02-16T18:21:41Z)
• Deterministic correction of qubit loss [48.43720700248091]
  Loss of qubits poses one of the fundamental obstacles towards large-scale and fault-tolerant quantum information processors. We experimentally demonstrate the implementation of a full cycle of qubit loss detection and correction on a minimal instance of a topological surface code.
  arXiv  Detail & Related papers  (2020-02-21T19:48:53Z)

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.