Coherent interaction-free detection of noise

• URL: http://arxiv.org/abs/2312.17190v2
• Date: Thu, 5 Sep 2024 11:39:09 GMT
• Title: Coherent interaction-free detection of noise
• Authors: John J. McCord, Shruti Dogra, Gheorghe Sorin Paraoanu,
• Abstract summary: We propose interaction-free measurements as a noise-detection technique. We explore two conceptually different schemes: the coherent and the projective realizations. We study the signature of noise correlations in the detector's signal.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The measurement and characterization of noise is a flourishing area of research in mesoscopic physics. In this work, we propose interaction-free measurements as a noise-detection technique, exploring two conceptually different schemes: the coherent and the projective realizations. These detectors consist of a qutrit whose second transition is resonantly coupled to an oscillatory field that may have noise in amplitude or phase. For comparison, we consider a more standard detector previously discussed in this context: a qubit coupled in a similar way to the noise source. We find that the qutrit scheme offers clear advantages, allowing precise detection and characterization of the noise, while the qubit does not. Finally, we study the signature of noise correlations in the detector's signal.

Related papers

• Stochastic action for the entanglement of a noisy monitored two-qubit system [55.2480439325792]
  We study the effect of local unitary noise on the entanglement evolution of a two-qubit system subject to local monitoring and inter-qubit coupling. We construct a Hamiltonian by incorporating the noise into the Chantasri-Dressel-Jordan path integral and use it to identify the optimal entanglement dynamics. Numerical investigation of long-time steady-state entanglement reveals a non-monotonic relationship between concurrence and noise strength.
  arXiv  Detail & Related papers  (2024-03-13T11:14:10Z)
• Interferometry with few photons [0.0]
  We experimentally reconstruct different wavefronts by means of a point diffraction interferometer for different mean intensities of illumination. For two cases of interest, a spatial qudit encoding phase, consisting of d = 6 uniform phase regions, and a more general continuous phase, we see that reducing the readout noise leads to a clear improvement in the quality of reconstruction.
  arXiv  Detail & Related papers  (2024-02-20T17:21:06Z)
• Spatio-temporal correlations of noise in MOS spin qubits [0.2981781876202281]
  We show how to decompose signals into both frequency and time components to gain a deeper insight into the sources of noise in our systems. We apply the analysis to a long feedback experiment performed on a state-of-the-art two-qubit system in a pair of SiMOS quantum dots.
  arXiv  Detail & Related papers  (2023-09-21T23:45:14Z)
• Parameter estimation from an Ornstein-Uhlenbeck process with measurement noise [0.0]
  We present an algorithm that can effectively separate thermal noise with comparable performance to Hamilton Monte Carlo. We show that, with additional knowledge of the ratio between thermal and multiplicative noise, we can accurately distinguish between the two types of noise.
  arXiv  Detail & Related papers  (2023-05-22T21:28:57Z)
• Evolution of many-body systems under ancilla quantum measurements [58.720142291102135]
  We study the concept of implementing quantum measurements by coupling a many-body lattice system to an ancillary degree of freedom. We find evidence of a disentangling-entangling measurement-induced transition as was previously observed in more abstract models.
  arXiv  Detail & Related papers  (2023-03-13T13:06:40Z)
• 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)
• 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)
• Noise Effects on the Wilczek-Zee Geometric Phase [0.0]
  Non-abelian geometric phases are dependent on noise. Noise of frequency $m = 2$ has a very different, and, at the same time, very pronounced effect.
  arXiv  Detail & Related papers  (2021-03-20T06:13:56Z)

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.