Question: The first person to interpret Relational quantum mechanics has worked in what countries? 

Context paragraphs:
Relational approach to quantum physics: The relational approach to quantum physics is an alternative approach to and interpretation of quantum mechanics.  It asserts that the physical world can only be studied accurately in terms of "relationships" between systems, as all experimentally verifiable facts about the world result explicitly from interactions (such as the interaction between a light field and a detector).  According to the relational approach, the assumption that objects possess absolute properties (such as an absolute particle, independent of any detection frame) inevitably leads to ambiguities and paradoxes when these objects are studied closely.  The approach was adopted, in a time span of 1992-1996, by Q. Zheng, S. Hughes, and T. Kobayashi in the University of Tokyo.  As early as in 1985, S. Kochen suggested that the paradoxes of quantum physics could be overcome by developing a relational approach, which was needed at one time to solve the paradoxes of relativistic physics of space and time.  It is also hoped that this entry will serve as a complement to Rovelli’s relational quantum mechanics (RQM).

Yellow Vector (Ki no Taji Gen Shikousei): 'Yellow Vector – Ki no Taji Gen Shikousei-' ("Yellow Vector"－黄の多次限指向性-), also known as "Quantum Mechanics Rainbow V: Yellow Vector", is the tenth solo album from Japanese musician Daisuke Asakura released on November 30, 2004.  The album is the fifth in the Quantum Mechanics Rainbow series.  The concept of this series is "one album for every rainbow color and a different Quantum Mechanics term".  Track 7 is dedicated to D.A.N.K, a boy band Asakura formed in a futile attempt to copy the popularity of Japanese music company Johnny’s Entertainment Company.  Tracks 1 and 8 make references to physicist Erwin Schrödinger and mathematician Pierre-Simon Laplace, respectively.  Track 5 contains guest vocals from Mayumi Fujita, who has performed vocals on several of Asakura’s Quantum Mechanics Rainbow albums.

Relativistic quantum mechanics: In physics, relativistic quantum mechanics (RQM) is any Poincaré covariant formulation of quantum mechanics (QM).  This theory is applicable to massive particles propagating at all velocities up to those comparable to the speed of light "c", and can accommodate massless particles.  The theory has application in high energy physics, particle physics and accelerator physics, as well as atomic physics, chemistry and condensed matter physics.  "Non-relativistic quantum mechanics" refers to the mathematical formulation of quantum mechanics applied in the context of Galilean relativity, more specifically quantizing the equations of classical mechanics by replacing dynamical variables by operators. "Relativistic quantum mechanics" (RQM) is quantum mechanics applied with special relativity, but not general relativity.  Although the earlier formulations, like the Schrödinger picture and Heisenberg picture were originally formulated in a non-relativistic background, these pictures of quantum mechanics also apply with special relativity.

Jose Acacio de Barros: José Acacio de Barros (born 1967, Barra Mansa, RJ, Brazil) is a Brazilian-American physicist and philosopher with contributions to the foundations of quantum mechanics, quantum cosmology, and quantum cognition.  Dr. de Barros received his PhD in Physics from the Centro Brasileiro de Pesquisas Fisicas (CBPF) in 1991 under the supervision of Francisco Antonio Doria and Antonio Fernandes da Fonseca Teixeira (he was also informally under the supervision of Newton da Costa).  Since 2007 he has been in the Liberal Studies faculty of San Francisco State University.  Before going to San Francisco, he was an Associate Professor of Physics at the Federal University at Juiz de Fora, Brazil, and he was a Visiting Associate Professor at the Center for the Study of Language and Information at Stanford University, and has also held visiting positions at the Centro Brasileiro de Pesquisas Fisicas.  Dr. de Barros has been a long-term collaborator of Philosopher Patrick Suppes, with whom he published extensively on the foundations of quantum mechanics and joint probabilities.  Among his most influential work is his joint research with Nelson Pinto-Neto, in which Bohm's interpretation of quantum mechanics was applied to quantum cosmology, paving the way for bouncing models using realistic interpretation of quantum mechanics.  His recent work attempts to give a neurophysiological foundation to quantum-like effects in psychology.  He is also among the main proponents, in collaboration with Gary Oas, of the use of negative probabilities to understand quantum systems.

Quantum chaos: Quantum chaos is a branch of physics which studies how chaotic classical dynamical systems can be described in terms of quantum theory.  The primary question that quantum chaos seeks to answer is: "What is the relationship between quantum mechanics and classical chaos?"  The correspondence principle states that classical mechanics is the classical limit of quantum mechanics.  If this is true, then there must be quantum mechanisms underlying classical chaos (although this may not be a fruitful way of examining classical chaos).  If quantum mechanics does not demonstrate an exponential sensitivity to initial conditions, how can exponential sensitivity to initial conditions arise in classical chaos, which must be the correspondence principle limit of quantum mechanics?  In seeking to address the basic question of quantum chaos, several approaches have been employed:

Relational quantum mechanics: Relational quantum mechanics (RQM) is an interpretation of quantum mechanics which treats the state of a quantum system as being observer-dependent, that is, the state "is" the relation between the observer and the system.  This interpretation was first delineated by Carlo Rovelli in a 1994 preprint, and has since been expanded upon by a number of theorists.  It is inspired by the key idea behind special relativity, that the details of an observation depend on the reference frame of the observer, and uses some ideas from Wheeler on quantum information.

Consistent histories: In quantum mechanics, the consistent histories (also referred to as decoherent histories) approach is intended to give a modern interpretation of quantum mechanics, generalising the conventional Copenhagen interpretation and providing a natural interpretation of quantum cosmology.  This interpretation of quantum mechanics is based on a consistency criterion that then allows probabilities to be assigned to various alternative histories of a system such that the probabilities for each history obey the rules of classical probability while being consistent with the Schrödinger equation.  In contrast to some interpretations of quantum mechanics, particularly the Copenhagen interpretation, the framework does not include "wavefunction collapse" as a relevant description of any physical process, and emphasizes that measurement theory is not a fundamental ingredient of quantum mechanics.

Quantum machine: A quantum machine is a human-made device whose collective motion follows the laws of quantum mechanics.  The idea that macroscopic objects may follow the laws of quantum mechanics dates back to the advent of quantum mechanics in the early 20th century.  However, as highlighted by the Schrödinger's cat thought experiment, quantum effects are not readily observable in large-scale objects.  Consequently, quantum states of motion have only been observed in special circumstances at extremely low temperatures.  The fragility of quantum effects in macroscopic objects may arise from rapid quantum decoherence.  Researchers created the first quantum machine in 2009, and the achievement was named the "Breakthrough of the Year" by "Science" in 2010.

Carlo Rovelli: Carlo Rovelli (born 3 May 1956) is an Italian theoretical physicist and writer who has worked in Italy, the United States and since 2000, in France.  His work is mainly in the field of quantum gravity, where he is among the founders of the loop quantum gravity theory.  He has also worked in the history and philosophy of science.  He collaborates regularly with several Italian newspapers, in particular the cultural supplements of "Il Corriere della Sera", "Il Sole 24 Ore" and "La Repubblica".

Interpretations of quantum mechanics: An interpretation of quantum mechanics is a set of statements which attempt to explain how quantum mechanics informs our understanding of nature.  Although quantum mechanics has held up to rigorous and thorough experimental testing, many of these experiments are open to different interpretations.  There exist a number of contending schools of thought, differing over whether quantum mechanics can be understood to be deterministic, which elements of quantum mechanics can be considered "real", and other matters.

Supporting paragraphs: Relational quantum mechanics Carlo Rovelli
Answer: Italy, the United States and since 2000, in France