Correlations of the Time Dependent Signal and the State of a Continuously Monitored Quantum System

2015/08/31 by N. Foroozani, M. Naghiloo, Mahdi Naghiloo +4 · 3 citations
Computer Science · Physics and Astronomy · #Photodetection #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum error correction #Quantum mechanics #Quantum state #Quantum system #Qubit #Statistical physics #Weak measurement #cond-mat.mes-hall #physics.atom-ph #quant-ph

paper · pdf · doi:10.1103/physrevlett.116.110401

published as Phys. Rev. Lett. 116, 110401 (2016) · 8 pages 5 figures

arxiv created 2015/10/12 · openalex publication_date 2016/03/17 · arxiv updated 2016/03/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

In quantum physics, measurements give random results and yield a corresponding random backaction on the state of the system subject to measurement. If a quantum system is probed continuously over time, its state evolves along a stochastic quantum trajectory. To investigate the characteristic properties of such dynamics, we perform weak continuous measurements on a superconducting qubit that is driven to undergo Rabi oscillations. From the data we observe a number of striking temporal correlations within the time dependent signals and the quantum trajectories of the qubit, and we discuss their explanation in terms of quantum measurement and photodetection theory.

Citations

• Charge insensitive qubit design derived from the Cooper pair box
• A straightforward introduction to continuous quantum measurement
• The Quantum Theory of Optical Coherence
• Preserving entanglement during weak measurement demonstrated with a violation of the Bell-Leggett-Garg inequality

Cited by

• Entropic relations for retrodicted quantum measurements
• Counting statistics of photon emissions detected in non-Markovian environment
• Quantum process inference for a single-qubit Maxwell demon