Related papers: Spatial noise correlations beyond nearest-neighbor in ${}^{28}$Si/SiGe spin qubits

Spatial noise correlations beyond nearest-neighbor in ${}^{28}$Si/SiGe spin qubits

URL: http://arxiv.org/abs/2302.11717v1
Date: Thu, 23 Feb 2023 00:45:30 GMT
Title: Spatial noise correlations beyond nearest-neighbor in ${}^{28}$Si/SiGe spin qubits
Authors: Juan S. Rojas-Arias, Akito Noiri, Peter Stano, Takashi Nakajima, Jun Yoneda, Kenta Takeda, Takashi Kobayashi, Amir Sammak, Giordano Scappucci, Daniel Loss, Seigo Tarucha
Abstract summary: We detect correlations in qubit-energy fluctuations of non-neighboring qubits defined in isotopically Si/SiGe quantum dots. At low frequencies, the correlation coefficient reaches 10% for a next-nearest-neighbor qubit-pair separated by 200 nm.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We detect correlations in qubit-energy fluctuations of non-neighboring qubits defined in isotopically purified Si/SiGe quantum dots. At low frequencies (where the noise is strongest), the correlation coefficient reaches 10% for a next-nearest-neighbor qubit-pair separated by 200 nm. Assigning the observed noise to be of electrical origin, a simple theoretical model quantitatively reproduces the measurements and predicts a polynomial decay of correlations with interqubit distance. Our results quantify long-range correlations of noise dephasing quantum-dot spin qubits arranged in arrays, essential for scalability and fault-tolerance of such systems.

Related papers

Spatially correlated classical and quantum noise in driven qubits: The good, the bad, and the ugly [0.0]
Correlated noise across multiple qubits poses a significant challenge for achieving scalable quantum processors. We study the dynamics of driven qubits under spatially correlated noise, including both Markovian and non-Markovian noise. In particular, we reveal that, in the quantum limit, pure dephasing noise induces a coherent long-range two-qubit Ising interaction that correlates distant qubits.
arXiv Detail & Related papers (2023-08-06T08:34:49Z)
Star network non-n-local correlations can resist consistency noises better [0.0]
We find that star network quantum non-n-local correlations can resist better consistency noises than these in polygon and linear networks. Polygon and linear network non-n-local correlations can not meet the requirements.
arXiv Detail & Related papers (2023-07-18T14:35:00Z)
Phase Randomness in a Semiconductor Laser: the Issue of Quantum Random Number Generation [83.48996461770017]
This paper describes theoretical and experimental methods for estimating the degree of phase randomization in a gain-switched laser. We show that the interference signal remains quantum in nature even in the presence of classical phase drift in the interferometer.
arXiv Detail & Related papers (2022-09-20T14:07:39Z)
Noise-correlation spectrum for a pair of spin qubits in silicon [0.0]
We quantify the degree of noise correlation in a pair of neighbouring silicon spin qubits 100 nm apart. We reveal strong inter-qubit noise correlation with a correlation strength as large as 0.7 at 1 Hz. We furthermore find that fluctuations of single-spin precession rates are strongly correlated with exchange noise, giving away their electrical origin.
arXiv Detail & Related papers (2022-08-30T11:10:11Z)
Characterizing low-frequency qubit noise [55.41644538483948]
Fluctuations of the qubit frequencies are one of the major problems to overcome on the way to scalable quantum computers. The statistics of the fluctuations can be characterized by measuring the correlators of the outcomes of periodically repeated Ramsey measurements. This work suggests a method that allows describing qubit dynamics during repeated measurements in the presence of evolving noise.
arXiv Detail & Related papers (2022-07-04T22:48:43Z)
Stabilizing and improving qubit coherence by engineering noise spectrum of two-level systems [52.77024349608834]
Superconducting circuits are a leading platform for quantum computing. Charge fluctuators inside amorphous oxide layers contribute to both low-frequency $1/f$ charge noise and high-frequency dielectric loss. We propose to mitigate those harmful effects by engineering the relevant TLS noise spectral densities.
arXiv Detail & Related papers (2022-06-21T18:37:38Z)
High-Order Qubit Dephasing at Sweet Spots by Non-Gaussian Fluctuators: Symmetry Breaking and Floquet Protection [55.41644538483948]
We study the qubit dephasing caused by the non-Gaussian fluctuators. We predict a symmetry-breaking effect that is unique to the non-Gaussian noise.
arXiv Detail & Related papers (2022-06-06T18:02:38Z)
Learning Noise via Dynamical Decoupling of Entangled Qubits [49.38020717064383]
Noise in entangled quantum systems is difficult to characterize due to many-body effects involving multiple degrees of freedom. We develop and apply multi-qubit dynamical decoupling sequences that characterize noise that occurs during two-qubit gates.
arXiv Detail & Related papers (2022-01-26T20:22:38Z)
Numerical Simulations of Noisy Quantum Circuits for Computational Chemistry [51.827942608832025]
Near-term quantum computers can calculate the ground-state properties of small molecules. We show how the structure of the computational ansatz as well as the errors induced by device noise affect the calculation.
arXiv Detail & Related papers (2021-12-31T16:33:10Z)
Robustness of Measurement-Induced Correlations Under Decoherence Effect [0.0]
We study the dynamics of quantum correlation measures such as entanglement and measurement-induced nonlocality (MIN) It is observed that all the noises cause sudden death of entanglement for partially entangled states. We show the existence of separable quantum states with non-zero quantum correlations in terms of MIN.
arXiv Detail & Related papers (2020-04-10T16:54:10Z)

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