Reality variation under monitoring with weak measurements

Authors: Marcos L. W. Basso, Jonas Maziero

Quantum Inf. Process. 21, 255 (2022)
arXiv: 2112.05882v2 - DOI (quant-ph)
7 pages, 7 figures, 1 table

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In their paper titled "Reality Variation Under Monitoring with Weak Measurements," Marcos L. W. Basso and Jonas Maziero delve into the concept of reality variation in quantum systems. They build upon the foundational work of Bilobran and Angelo on (ir)reality characterization and Dieguez and Angelo's exploration of reality variation through monitoring with weak measurements. Inspired by Einstein-Podolsky-Rosen's elements of reality, Bilobran and Angelo developed a formal framework for understanding (ir)reality in quantum systems. This framework defines a measure of (ir)realism or (in)definiteness for observables based on system preparation. Building on this foundation, Dieguez and Angelo introduced the concept of monitoring through weak projective non-revealed measurements to study how reality varies for different observables. They particularly focused on the relationship between an observable X and its incompatible counterpart X'. The authors found that an unrevealed measurement of observable X typically increases its reality, consequently boosting the reality of incompatible observables like X'. However, they also discovered intriguing nuances in this relationship. Surprisingly, they observed scenarios where the variation in the reality of X' exceeded that of X, challenging conventional expectations. Additionally, they noted instances where the monitoring map applied to X did not impact the established reality of X', even when these observables were maximally incompatible. Moreover, Basso and Maziero investigated whether the variation in reality was consistent across different pairs of observables under monitoring. They found cases where both observables experienced identical changes in reality despite being maximally incompatible. To support their theoretical findings, the authors devised a quantum circuit to implement the monitoring map experimentally using IBM's quantum computers. Overall, this study provides valuable insights into how reality evolves within quantum systems under weak measurements and offers new perspectives on the dynamics of (ir)reality relationships between observables in quantum mechanics.
AI-generated keywords: Reality variation Weak measurements Quantum systems (Ir)reality characterization Monitoring

AI-generated Key Points

  • Marcos L. W. Basso and Jonas Maziero explore reality variation in quantum systems
  • Bilobran and Angelo developed a formal framework for understanding (ir)reality in quantum systems
  • Dieguez and Angelo introduced monitoring through weak projective non-revealed measurements to study reality variation for different observables
  • Monitoring observable X typically increases its reality, affecting incompatible observables like X'
  • Surprising scenarios were observed where the reality of X' exceeded that of X, challenging conventional expectations
  • Instances were noted where monitoring X did not impact the established reality of maximally incompatible observable X'
  • Investigation into consistency of reality variation across different pairs of observables under monitoring
  • The authors devised a quantum circuit to implement the monitoring map experimentally using IBM's quantum computers
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Abstract: Recently, inspired by Einstein-Podolsky-Rosen's notion of elements of reality, Bilobran and Angelo gave a formal and operational characterization of (ir)reality [EPL 112, 40005 (2015)]. From this approach, the authors were able to define a measure of (ir)realism, or (in)definiteness, of an observable given a preparation of a quantum system. As well, in [Phys. Rev. A 97, 022107 (2018)], Dieguez and Angelo studied the variation of reality of observables by introducing a map, called monitoring, through weak projective non-revealed measurements. The authors showed that an arbitrary-intensity unrevealed measurement of a given observable $X$ generally increases its reality, also increasing the reality of its incompatible observables $X'$. However, from these results, natural questions arise: under the monitoring map of $X$, how much does the reality of $X'$ increase in comparison to that of $X$? Does it always increase? This is the kind of question we address in this article. Surprisingly, we show that it is possible that the variation of the reality of $X'$ is bigger than the variation of the reality of $X$. As well, the monitoring map of $X$ does not affect the already established reality of $X'$, even when they are maximally incompatible. On the other hand, there are circumstances where the variation of reality of both observables is the same, even when they are maximally incompatible. Besides, we give a quantum circuit to implement the monitoring map and use it to experimentally verify the variation of reality of observables using IBM's quantum computers.

Submitted to arXiv on 11 Dec. 2021

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