RQC Seminar

13th RQC Seminar

• Speaker

  Prof. Henning Schomerus
  (Department of Physics, Lancaster University, UK）

• Date

  16:00-17:00 (JST), September 1, 2022 (Thursday)

• Venue

  Hybrid (Zoom / 2F Large Conference Room, Admin. Headquarters Bldg. RIKEN Wako branch)

• Title

  Noisy monitored quantum dynamics in multi-qubit systems

• Inquiries

  rqc_info[at]ml.riken.jp

Abstract
Environmental effects on qubits can be divided into noisy fluctuations of their unitary dynamics and monitoring processes that induce decoherence. I describe statistical approaches rooted in random matrix theory that address the interplay of these effects. The combined dynamics drive the system into states whose statistics reflect the competition of randomizing unitary evolution and the measurement-induced backaction collapsing the state. For the paradigmatic case of monitoring an ergodic qubit assembly via a single designated qubit, this reveals a simple statistical mechanism, in which the monitoring conditions the state of the monitored qubit, which then imposes statistical constraints on the remaining quantities of the system. I supplement this discussion by numerical results on quasi-one-dimensional continuously monitored qubit systems.
References:
M. Szyniszewski, A. Romito, and H. Schomerus, Phys. Rev. B 100, 064204 (2019).
M. Szyniszewski, A. Romito, and H. Schomerus, Phys. Rev. Lett. 125, 210602 (2020).
H. Schomerus, J. Phys. A 55, 214001 (2022).
T. Kalsi, A. Romito, and H. Schomerus, J. Phys. A 55, 264009 (2022).
T. Boorman, M. Szyniszewski, H. Schomerus, and A. Romito, Phys. Rev. B 105, 144202 (2022).