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Peter Renkel

Publications and source records attributed to Peter Renkel.

5 recordsLinked to original sources
arXiv2026

Can a Measurement Be Undone? Recovering the State of a Measured Microscopic System with a Reversible Measuring Apparatus

We propose a direct, model-independent search for irreversible coherence loss during a reversible measurement. A mesoscopic apparatus measures a microscopic two-state system by storing which-state information and is then returned to its pre-measurement state; unitary quantum mechanics predicts recovered coherence, while collapse leaves residual endpoint loss. In one representative device, a coherently controlled molecular force source displaces a charged nanoparticle that serves as the apparatus; during one $4.19\,{\rm ms}$ measurement-and-reversal cycle, its two states become almost fully distinguishable. Such a device would give a first direct bound in a measurement-and-reversal setting. Repeating this cycle $5\times10^5$ times would bound the corresponding irreversible coherence-loss rate beyond ordinary decoherence at $5.51\,{\rm s}^{-1}$. Continuous Spontaneous Localization is included as a secondary benchmark on the same apparatus history.

quant-ph↗
arXiv2025

Experimental Approaches to Distinguishing Quantum Collapse from Unitary Evolution: A Weak Measurement Perspective

This paper proposes an experiment designed to distinguish between competing interpretations of quantum mechanics: those that involve wave function collapse and those that assume purely unitary evolution. The experiment tests whether an observer can measure a system without collapsing its wave function. To this end, we introduce the concept of an unconscious observer, defined by two criteria: (1) It measures a quantum system and sets the state of another system based on the result. (2) It allows an external experimentalist to infer the measurement outcome by examining the observer's state. The more distinguishable the observer's resulting states, the more it resembles a conventional measurement apparatus. Using weak measurements, the experimentalist probes these states, thereby testing the second criterion. The interference patterns observed in this setup reveal whether collapse has occurred, allowing experimental discrimination between collapse-based and unitary interpretations.

quant-ph↗
arXiv2017

Building a bridge between Classical and Quantum Mechanics

The way Quantum Mechanics (QM) is introduced to people used to Classical Mechanics (CM) is by a complete change of the general methodology) despite QM historically stemming from CM as a means to explain experimental results. Therefore, it is desirable to build a bridge from CM to QM. This paper presents a generalization of CM to QM. It starts from the generalization of a point-like object and naturally arrives at the quantum state vector of quantum systems in the complex valued Hilbert space, its time evolution and quantum representation of a measurement apparatus of any size. Each time, when generalization is performed, there is a possibility to develop new theory giving up most simple generalizations. It is shown that a measurement apparatus is a special case of a general quantum object. An example of a measurement apparatus of an intermediate size is considered in the end.

physics.gen-ph↗
arXiv2004

A New Algorithm for Inclusive Search of SUSY Signal

A new algorithm designed to reduce the model dependence in future SUSY searches at the LHC is described. This algorithm can dynamically adapt itself to a wide range of possible SUSY final states thus reducing the need for detailed model-driven analysis. Preliminary study of its performance on simulated MSSM, GMSB and AMSB final states is described, and a comparison with traditional search procedures, whenever available, is performed.

hep-ph↗