Measurement-device agnostic quantum tomography

• URL: http://arxiv.org/abs/2407.13011v5
• Date: Thu, 09 Oct 2025 16:53:27 GMT
• Title: Measurement-device agnostic quantum tomography
• Authors: Robert Stárek, Martin Bielak, Miroslav Ježek,
• Abstract summary: We show that a mismatch between actual and assumed constituent measurements limits the accuracy of quantum state tomography.<n>We use these artifacts to detect and quantify the mismatch, gaining information about the actual measurement operators.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Characterization of quantum states and devices is paramount to quantum science and technology. The characterization consists of individual measurements, which must be precisely known. A mismatch between actual and assumed constituent measurements limits the accuracy of this characterization. We show that such a mismatch introduces reconstruction artifacts in quantum state tomography. We use these artifacts to detect and quantify the mismatch, gaining information about the actual measurement operators. It consequently allows the mitigation of systematic errors in both quantum measurement and state preparation, improving the precision of state control and characterization. The practical utility of our approach is experimentally demonstrated.

Related papers

• Blind calibration of a quantum computer [0.22615818641180715]
  We develop an accurate calibration protocol that is blind to the precise preparation of a specific quantum state.<n>It extracts device errors from simple tomographic data only, and does not require bespoke experiments for a priori specified error mechanisms.
  arXiv  Detail & Related papers  (2025-01-09T16:36:38Z)
• Can we accurately read or write quantum data? [0.0]
  I show that accurate measurements and preparations are impossible if the total Hamiltonian is bounded from below. This result invites a reevaluation of the limitations of quantum control, quantum computing, and other quantum technologies.
  arXiv  Detail & Related papers  (2024-04-08T16:09:51Z)
• Measurement-Device-Independent Detection of Beyond-Quantum State [53.64687146666141]
  We propose a measurement-device-independent (MDI) test for beyond-quantum state detection. We discuss the importance of tomographic completeness of the input sets to the detection.
  arXiv  Detail & Related papers  (2023-12-11T06:40:13Z)
• A universal scheme to self-test any quantum state and extremal measurement [41.94295877935867]
  quantum network considered in this work is the simple star network, which is implementable using current technologies. For our purposes, we also construct a scheme that can be used to self-test the two-dimensional tomographically complete set of measurements with an arbitrary number of parties.
  arXiv  Detail & Related papers  (2023-12-07T16:20:28Z)
• Enhanced Entanglement in the Measurement-Altered Quantum Ising Chain [46.99825956909532]
  Local quantum measurements do not simply disentangle degrees of freedom, but may actually strengthen the entanglement in the system. This paper explores how a finite density of local measurement modifies a given state's entanglement structure.
  arXiv  Detail & Related papers  (2023-10-04T09:51:00Z)
• Quantifying measurement-induced quantum-to-classical crossover using an open-system entanglement measure [49.1574468325115]
  We study the entanglement of a single particle under continuous measurements. We find that the entanglement at intermediate time scales shows the same qualitative behavior as a function of the measurement strength.
  arXiv  Detail & Related papers  (2023-04-06T09:45:11Z)
• Measurement-induced entanglement and teleportation on a noisy quantum processor [105.44548669906976]
  We investigate measurement-induced quantum information phases on up to 70 superconducting qubits. We use a duality mapping, to avoid mid-circuit measurement and access different manifestations of the underlying phases. Our work demonstrates an approach to realize measurement-induced physics at scales that are at the limits of current NISQ processors.
  arXiv  Detail & Related papers  (2023-03-08T18:41:53Z)
• Deep learning of quantum entanglement from incomplete measurements [0.2493740042317776]
  We demonstrate that by employing neural networks we can quantify the degree of entanglement without needing to know the full description of the quantum state. Our method allows for direct quantification of the quantum correlations using an incomplete set of local measurements. We derive a method based on a convolutional network input that can accept data from various measurement scenarios and perform, to some extent, independently of the measurement device.
  arXiv  Detail & Related papers  (2022-05-03T12:55:39Z)
• Measuring NISQ Gate-Based Qubit Stability Using a 1+1 Field Theory and Cycle Benchmarking [50.8020641352841]
  We study coherent errors on a quantum hardware platform using a transverse field Ising model Hamiltonian as a sample user application. We identify inter-day and intra-day qubit calibration drift and the impacts of quantum circuit placement on groups of qubits in different physical locations on the processor. This paper also discusses how these measurements can provide a better understanding of these types of errors and how they may improve efforts to validate the accuracy of quantum computations.
  arXiv  Detail & Related papers  (2022-01-08T23:12:55Z)
• Characterizing quantum instruments: from non-demolition measurements to quantum error correction [48.43720700248091]
  In quantum information processing quantum operations are often processed alongside measurements which result in classical data. Non-unitary dynamical processes can take place on the system, for which common quantum channel descriptions fail to describe the time evolution. Quantum measurements are correctly treated by means of so-called quantum instruments capturing both classical outputs and post-measurement quantum states.
  arXiv  Detail & Related papers  (2021-10-13T18:00:13Z)
• Quantum-tailored machine-learning characterization of a superconducting qubit [50.591267188664666]
  We develop an approach to characterize the dynamics of a quantum device and learn device parameters. This approach outperforms physics-agnostic recurrent neural networks trained on numerically generated and experimental data. This demonstration shows how leveraging domain knowledge improves the accuracy and efficiency of this characterization task.
  arXiv  Detail & Related papers  (2021-06-24T15:58:57Z)
• Quantum tomography of noisy ion-based qudits [0.0]
  We show that it is possible to construct a quantum measurement protocol that contains no more than a single quantum operation in each measurement circuit. The measures described can significantly improve the accuracy of quantum tomography of real ion-based qudits.
  arXiv  Detail & Related papers  (2020-11-09T04:10:32Z)
• Direct state measurements under state-preparation-and-measurement errors [0.0]
  We investigate the measurement precision that undergoes the state-preparation-and-measurement errors. Our study could provide a reliable tool for SPAM errors tomography and contribute to understanding and resolving an urgent demand for current quantum technologies.
  arXiv  Detail & Related papers  (2020-07-10T10:45:02Z)
• Semi-device-dependent blind quantum tomography [1.3075880857448061]
  Current schemes typically require measurement devices for tomography that are a priori calibrated to high precision. We show that exploiting the natural low-rank structure of quantum states of interest suffices to arrive at a highly scalable blind' tomography scheme. We numerically demonstrate that robust blind quantum tomography is possible in a practical setting inspired by an implementation of trapped ions.
  arXiv  Detail & Related papers  (2020-06-04T18:00:04Z)
• Direct Characterization of Quantum Measurements using Weak Values [19.009425676277974]
  We propose and experimentally demonstrate the direct tomography of a measurement apparatus by taking the backward direction of weak measurement formalism. Our work provides new insight on the symmetry between quantum states and measurements, as well as an efficient method to characterize a measurement apparatus.
  arXiv  Detail & Related papers  (2020-05-21T02:00:37Z)
• 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)
• Systematic errors in direct state measurements with quantum controlled measurements [0.0]
  We use a quantum controlled measurement framework for measuring quantum states directly. We numerically investigate the systematic errors, evaluate the confidence region, and investigate the effect of experimental noise. Our analysis has important applications in direct quantum state tomography.
  arXiv  Detail & Related papers  (2020-02-18T01:40:30Z)

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.