Related papers: Certifying nonlocal properties of noisy quantum operations

Related papers

Machine Learning assisted noise classification with Quantum Key Distribution protocols [0.7373617024876725]
We consider the quantum bit error rates (QBERs) generated in quantum key distribution schemes under consideration of different noises.<n>Our protocol classifies quantum noises with high accuracy under the assumption of two different scenarios.<n>Our method is based on classical post processing of data generated from very simplistic quantum protocols.
arXiv Detail & Related papers (2025-04-01T12:30:47Z)
Theory of the correlated quantum Zeno effect in a monitored qubit dimer [41.94295877935867]
We show how the competition between two measurement processes give rise to two distinct Quantum Zeno (QZ) regimes. We develop a theory based on a Gutzwiller ansatz for the wavefunction that is able to capture the structure of the Hilbert phase diagram. We show how the two QZ regimes are intimately connected to the topology of the flow of the underlying non-Hermitian Hamiltonian governing the no-click evolution.
arXiv Detail & Related papers (2025-03-28T19:44:48Z)
Bounding the Sample Fluctuation for Pure States Certification with Local Random Measurement [4.923287660970805]
Recent advancements in randomized measurement techniques have provided fresh insights in this area. We investigate the fundamental properties of schemes that certify pure quantum states through random local Haar measurements. Our results unveil the intrinsic interplay between operator complexity and the efficiency of quantum algorithms, serving as an obstacle to local certification of pure states with long-range entanglement.
arXiv Detail & Related papers (2024-10-22T02:26:44Z)
Distributing quantum correlations through local operations and classical resources [0.0]
Global quantum correlations, as characterized by the discord, can be distributed to quantum memories using a mixed state of information carriers. We show that even more discord can be generated when the resource state undergoes correlated dephasing noise.
arXiv Detail & Related papers (2024-08-10T08:42:06Z)
Qudit-native measurement protocol for dynamical correlations using Hadamard tests [0.0]
Dynamical correlations reveal important out-of-equilibrium properties of the underlying quantum many-body system. We propose a modified protocol to overcome this limitation by decomposing qudit observables into unitary operations. Our scheme can readily be implemented on various platforms and offers a wide range of applications.
arXiv Detail & Related papers (2024-07-03T18:01:29Z)
Lindblad-like quantum tomography for non-Markovian quantum dynamical maps [46.350147604946095]
We introduce Lindblad-like quantum tomography (L$ell$QT) as a quantum characterization technique of time-correlated noise in quantum information processors.<n>We discuss L$ell$QT for the dephasing dynamics of single qubits in detail, which allows for a neat understanding of the importance of including multiple snapshots of the quantum evolution in the likelihood function.
arXiv Detail & Related papers (2024-03-28T19:29:12Z)
Tensor network noise characterization for near-term quantum computers [0.5277756703318045]
We show how experimentally feasible tomographic samples are sufficient to accurately characterize realistic correlated noise models. We combine this noise characterization method with a recently proposed noise-aware tensor network error mitigation protocol.
arXiv Detail & Related papers (2024-02-13T15:57:47Z)
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)
Geometry of sequential quantum correlations and robust randomness certification [0.0]
We study the geometry of quantum correlations and their implications for robust device-independent randomness generation. We identify a boundary for the set of these correlations expressed as a trade-off between the amount of nonlocality between different observers. We propose a practical protocol based on non-projective measurements that can produce the boundary correlations under ideal conditions.
arXiv Detail & Related papers (2023-09-21T17:50:29Z)
Efficient learning of the structure and parameters of local Pauli noise channels [1.5229257192293197]
We present a novel approach for learning Pauli noise channels over n qubits. We achieve our results by leveraging a groundbreaking result by Bresler for efficiently learning Gibbs measures. Our method is efficient both in the number of samples and postprocessing without giving up on other desirable features.
arXiv Detail & Related papers (2023-07-06T12:42:49Z)
Semi-device independent nonlocality certification for near-term quantum networks [46.37108901286964]
Bell tests are the most rigorous method for verifying entanglement in quantum networks. If there is any signaling between the parties, then the violation of Bell inequalities can no longer be used. We propose a semi-device independent protocol that allows us to numerically correct for effects of correlations in experimental probability distributions.
arXiv Detail & Related papers (2023-05-23T14:39:08Z)
Certifying activation of quantum correlations with finite data [0.0]
Quantum theory allows for different classes of correlations, such as entanglement, steerability or Bell-nonlocality. We show how our methods can be used to analyse the activation of quantum correlations by local filtering, specifically for Bell-nonlocality and quantum steerability.
arXiv Detail & Related papers (2023-05-05T18:00:00Z)
Quantum Conformal Prediction for Reliable Uncertainty Quantification in Quantum Machine Learning [47.991114317813555]
Quantum models implement implicit probabilistic predictors that produce multiple random decisions for each input through measurement shots. This paper proposes to leverage such randomness to define prediction sets for both classification and regression that provably capture the uncertainty of the model.
arXiv Detail & Related papers (2023-04-06T22:05:21Z)
Certified Robustness of Quantum Classifiers against Adversarial Examples through Quantum Noise [68.1992787416233]
We show that adding quantum random rotation noise can improve robustness in quantum classifiers against adversarial attacks. We derive a certified robustness bound to enable quantum classifiers to defend against adversarial examples.
arXiv Detail & Related papers (2022-11-02T05:17:04Z)
Suppressing Amplitude Damping in Trapped Ions: Discrete Weak Measurements for a Non-unitary Probabilistic Noise Filter [62.997667081978825]
We introduce a low-overhead protocol to reverse this degradation. We present two trapped-ion schemes for the implementation of a non-unitary probabilistic filter against amplitude damping noise. This filter can be understood as a protocol for single-copy quasi-distillation.
arXiv Detail & Related papers (2022-09-06T18:18:41Z)
Estimation of correlations and non-separability in quantum channels via unitarity benchmarking [0.0]
Correlation structures in quantum channels are less studied than those in quantum states. We develop a range of results for efficient estimation of correlations within a bipartite quantum channel. We show that correlated unitarity can be estimated in a SPAM-robust manner for any separable quantum channel.
arXiv Detail & Related papers (2021-04-09T13:29:37Z)
Efficient and robust certification of genuine multipartite entanglement in noisy quantum error correction circuits [58.720142291102135]
We introduce a conditional witnessing technique to certify genuine multipartite entanglement (GME) We prove that the detection of entanglement in a linear number of bipartitions by a number of measurements scales linearly, suffices to certify GME. We apply our method to the noisy readout of stabilizer operators of the distance-three topological color code and its flag-based fault-tolerant version.
arXiv Detail & Related papers (2020-10-06T18:00:07Z)
On the optimal certification of von Neumann measurements [55.41644538483948]
certification of quantum measurements can be viewed as the extension of quantum hypotheses testing. We show the connection between the certification of quantum channels or von Neumann measurements and the notion of $q$-numerical range.
arXiv Detail & Related papers (2020-09-14T22:38:23Z)
Environment-assisted bosonic quantum communications [0.0]
We consider a quantum relay which is used by two parties to perform several continuous-variable protocols of quantum communication. In the worst case scenario where bipartite entanglement is completely lost at the relay, we show that the various protocols can be reactivated by the assistance of classical (separable) correlations in the environment. Our findings are confirmed by a proof-of-principle experiment where we show, for the first time, that memory effects in the environment can drastically enhance the performance of a quantum relay.
arXiv Detail & Related papers (2020-03-20T12:58:44Z)
Distributed, partially collapsed MCMC for Bayesian Nonparametrics [68.5279360794418]
We exploit the fact that completely random measures, which commonly used models like the Dirichlet process and the beta-Bernoulli process can be expressed as, are decomposable into independent sub-measures. We use this decomposition to partition the latent measure into a finite measure containing only instantiated components, and an infinite measure containing all other components. The resulting hybrid algorithm can be applied to allow scalable inference without sacrificing convergence guarantees.
arXiv Detail & Related papers (2020-01-15T23:10:13Z)

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