Estimation of the Laser Frequency Nosie Spectrum by Continuous Dynamical Decoupling

• URL: http://arxiv.org/abs/2005.03908v3
• Date: Tue, 22 Dec 2020 02:24:23 GMT
• Title: Estimation of the Laser Frequency Nosie Spectrum by Continuous Dynamical Decoupling
• Authors: Manchao Zhang, Yi Xie, Jie Zhang, Weichen Wang, Chunwang Wu, Ting Chen, Wei Wu and Pingxing Chen
• Abstract summary: Decoherence induced by the laser frequency noise is one of the most important obstacles in quantum information processing. Here, we theoretically analyze and experimentally obtain the spectrum of laser frequency noise based on the continuous dynamical decoupling technique.
• Score: 13.924137853511146
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Decoherence induced by the laser frequency noise is one of the most important obstacles in the quantum information processing. In order to suppress this decoherence, the noise power spectral density needs to be accurately characterized. In particular, the noise spectrum measurement based on the coherence characteristics of qubits would be a meaningful and still challenging method. Here, we theoretically analyze and experimentally obtain the spectrum of laser frequency noise based on the continuous dynamical decoupling technique. We first estimate the mixture-noise (including laser and magnetic noises) spectrum up to $(2\pi)$530 kHz by monitoring the transverse relaxation from an initial state $+X$, followed by a gradient descent data process protocol. Then the contribution from the laser noise is extracted by enconding the qubits on different Zeeman sublevels. We also investigate two sufficiently strong noise components by making an analogy between these noises and driving lasers whose linewidth assumed to be negligible. This method is verified experimentally and finally helps to characterize the noise.

Related papers

• Amplitude and phase noise in Two-membrane cavity optomechanics [0.0]
  We consider a Fabry-Per'ot cavity, driven by two laser fields, with two partially reflective SiN membranes inside it. We describe the effects of amplitude and phase noise on the laser introducing two additional noise terms in the Langevin equations of the system's dynamics.
  arXiv  Detail & Related papers  (2023-05-19T11:12:33Z)
• Random Pulse Sequences for Qubit Noise Spectroscopy [0.7782749017947664]
  Qubit noise spectroscopy is an important tool for the experimental investigation of open quantum systems. Here we describe an alternative method for quickly characterizing the spectral density. Our simulations of the performance of the random pulse sequences on a realistic physical system, self-assembled quantum dots, reveal a speedup of an order of magnitude in extracting the noise spectrum.
  arXiv  Detail & Related papers  (2023-03-02T02:01:30Z)
• Theory of qubit noise characterization using the long-time cavity transmission [0.0]
  Noise induced decoherence is one of the main threats to large-scale quantum computation. We solve the quantum Langevin equations exactly for a noise-free system and treat the noise as a perturbation. We find that noise characteristics are imprinted in the long-time transmission in convolutions containing the power spectral density.
  arXiv  Detail & Related papers  (2022-10-21T11:39:50Z)
• Sensitivity of quantum gate fidelity to laser phase and intensity noise [0.0]
  We quantify the sensitivity of quantum gate fidelities to laser phase and intensity noise. Our results establish requirements on laser noise levels needed to achieve desired gate fidelities.
  arXiv  Detail & Related papers  (2022-10-20T04:23:15Z)
• 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)
• 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)
• 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)
• Fingerprints of Qubit Noise in Transient Cavity Transmission [0.0]
  We study a generic two-level system with fluctuating control parameters in a photonic cavity. We find that basic features of the noise spectral density are imprinted in the transient transmission through the cavity. We propose a way of extracting the spectral density for arbitrary noise in a frequency band only bounded by the range of the qubit-cavity detuning.
  arXiv  Detail & Related papers  (2022-01-21T12:37:27Z)
• Frequency fluctuations of ferromagnetic resonances at milliKelvin temperatures [50.591267188664666]
  Noise is detrimental to device performance, especially for quantum coherent circuits. Recent efforts have demonstrated routes to utilizing magnon systems for quantum technologies, which are based on single magnons to superconducting qubits. Researching the temporal behavior can help to identify the underlying noise sources.
  arXiv  Detail & Related papers  (2021-07-14T08:00:37Z)
• Mid-infrared homodyne balanced detector for quantum light characterization [52.77024349608834]
  We present the characterization of a novel balanced homodyne detector operating in the mid-infrared. We discuss the experimental results with a view to possible applications to quantum technologies, such as free-space quantum communication.
  arXiv  Detail & Related papers  (2021-03-16T11:08:50Z)
• Quantum sensitivity limits of nuclear magnetic resonance experiments searching for new fundamental physics [91.6474995587871]
  Nuclear magnetic resonance is a promising experimental approach to search for ultra-light axion-like dark matter. We consider a circuit model of a magnetic resonance experiment and quantify three noise sources: spin-projection noise, thermal noise, and amplifier noise.
  arXiv  Detail & Related papers  (2021-03-10T19:00:02Z)

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.