Anti-Zeno purification of spin baths by quantum probe measurements

• URL: http://arxiv.org/abs/2108.09826v2
• Date: Tue, 8 Nov 2022 15:00:02 GMT
• Title: Anti-Zeno purification of spin baths by quantum probe measurements
• Authors: Durga Bhaktavatsala Rao Dasari, Sen Yang, Arnab Chakrabarti, Amit Finkler, Gershon Kurizki, and J\"org Wrachtrup
• Abstract summary: We introduce, theoretically and experimentally, the concept of controlling the bath state via selective measurements of the system. We show that at intervals corresponding to the anti-Zeno regime of the system-bath exchange, a sequence of measurements has strongly correlated outcomes.
• Score: 1.6976750743168605
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The quantum Zeno and anti-Zeno paradigms have thus far addressed the evolution control of a quantum system coupled to an immutable bath via non-selective measurements performed at appropriate intervals. We fundamentally modify these paradigms by introducing, theoretically and experimentally, the concept of controlling the bath state via selective measurements of the system (a qubit). We show that at intervals corresponding to the anti-Zeno regime of the system-bath exchange, a sequence of measurements has strongly correlated outcomes. These correlations can dramatically enhance the bath-state purity and yield a low-entropy steady state of the bath. The purified bath state persists long after the measurements are completed. Such purification enables the exploitation of spin baths as long-lived quantum memories or as quantum-enhanced sensors. The experiment involved a repeatedly probed defect center dephased by a nuclear spin bath in a diamond at low-temperature.

Related papers

• Dissipation-induced long-range order in the one-dimensional Bose-Hubbard model [0.6390468088226495]
  We study the stability of the Luttinger liquid and Mott insulating phases in the presence of local particle exchange. For an Ohmic bath, our numerical findings confirm the scaling prediction that the Luttinger-liquid phase becomes unstable at infinitesimal bath coupling. Our results are compatible with a stable dissipative Luttinger-liquid phase that transitions to a long-range ordered superfluid.
  arXiv  Detail & Related papers  (2023-11-13T19:04:09Z)
• Entanglement preservation in tripartite quantum systems under dephasing dynamics [0.0]
  We investigate the tripartite entanglement dynamics of pure and mixed states in the presence of a structured dephasing environment at finite temperature. We show that the robustness of the quantum system to decoherence is dependent on the distribution of entanglement. The sustainability of tripartite entanglement is shown to be enhanced significantly in presence of reservoir memory.
  arXiv  Detail & Related papers  (2023-11-09T06:19:08Z)
• Dephasing effects on quantum correlations and teleportation in presence of state dependent bath [0.0]
  We analyze the effect of state dependent bath on the quantum correlations and the fidelity of a single qubit teleportation. It is shown that due to the presence of initial system-bath correlations, the system maintains quantum correlations for long times.
  arXiv  Detail & Related papers  (2023-07-03T15:31:19Z)
• 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)
• 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)
• Detecting spin bath polarization with quantum quench phase shifts of single spins in diamond [9.257887191970825]
  Single-qubit sensing protocols can be used to measure qubit-bath coupling parameters. For sufficiently large coupling, the sensing protocol itself perturbs the bath, which is predicted to result in a characteristic response in the sensing measurements. Here, we observe this bath perturbation, also known as a quantum quench, by preparing the nuclear spin bath of a nitrogen-vacancy (NV) center in polarized initial states.
  arXiv  Detail & Related papers  (2023-03-03T21:54:35Z)
• Full counting statistics as probe of measurement-induced transitions in the quantum Ising chain [62.997667081978825]
  We show that local projective measurements induce a modification of the out-of-equilibrium probability distribution function of the local magnetization. In particular we describe how the probability distribution of the former shows different behaviour in the area-law and volume-law regimes.
  arXiv  Detail & Related papers  (2022-12-19T12:34:37Z)
• Collapse and revival structure of information backflow for a central spin coupled to a finite spin bath [0.0]
  We study the role of finite bath dimension in the Markovianity of quantum dynamics. We find novel periodic collapse-revival patterns in the information flow.
  arXiv  Detail & Related papers  (2022-09-14T10:40:17Z)
• Enhanced nonlinear quantum metrology with weakly coupled solitons and particle losses [58.720142291102135]
  We offer an interferometric procedure for phase parameters estimation at the Heisenberg (up to 1/N) and super-Heisenberg scaling levels. The heart of our setup is the novel soliton Josephson Junction (SJJ) system providing the formation of the quantum probe. We illustrate that such states are close to the optimal ones even with moderate losses.
  arXiv  Detail & Related papers  (2021-08-07T09:29:23Z)
• Taking the temperature of a pure quantum state [55.41644538483948]
  Temperature is a deceptively simple concept that still raises deep questions at the forefront of quantum physics research. We propose a scheme to measure the temperature of such pure states through quantum interference.
  arXiv  Detail & Related papers  (2021-03-30T18:18:37Z)
• Quantum Zeno effect appears in stages [64.41511459132334]
  In the quantum Zeno effect, quantum measurements can block the coherent oscillation of a two level system by freezing its state to one of the measurement eigenstates. We show that the onset of the Zeno regime is marked by a $textitcascade of transitions$ in the system dynamics as the measurement strength is increased.
  arXiv  Detail & Related papers  (2020-03-23T18:17:36Z)

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.