# Quantum theory as a universal physical theory

@article{Deutsch1985QuantumTA, title={Quantum theory as a universal physical theory}, author={David Deutsch}, journal={International Journal of Theoretical Physics}, year={1985}, volume={24}, pages={1-41} }

The problem of setting up quantum theory as a universal physical theory is investigated. It is shown that the existing formalism, in either the conventional or the Everett interpretation, must be supplemented by an additional structure, the “interpretation basis.” This is a preferred ordered orthonormal basis in the space of states. Quantum measurement theory is developed as a tool for determining the interpretation basis. The augmented quantum theory is discussed.

## 249 Citations

### Unitary quantum theories are incompatible with special relativity

- Physics
- 2018

It is shown that the combination of a unitary quantum theory and special relativity may lead to a contradiction when considering the statistics of certain measurement results in different Lorentz…

### Unitary quantum theory is incompatible with special relativity

- Physics, Philosophy
- 2018

It is shown that the combination of unitary quantum theory and special relativity may lead to a contradiction when considering the EPR correlations in different inertial frames in a…

### Preferred basis in the many-worlds interpretation of quantum mechanics and quantum cosmology

- Physics
- 1990

The authors revive an old proposal of Zeh (1986) for the preferred basis in the many-worlds interpretation of quantum mechanics. The algorithm for this basis reduces to the eigenvalue problems for…

### Locality in the Everett Interpretation of Quantum Field Theory

- Physics
- 2002

Recently it has been shown that transformations of Heisenberg-picture operators are the causal mechanism which allows Bell-theorem-violating correlations at a distance to coexist with locality in the…

### Quantum Prediction Algorithms

- Physics
- 1997

The consistent histories formulation of the quantum theory of a closed system with pure initial state defines an infinite number of incompatible consistent sets, each of which gives a possible…

### 2 00 2 Locality in the Everett Interpretation of Quantum Field Theory

- Physics
- 2002

Recently it has been shown that transformations of Heisenberg-picture operators are the causal mechanism which allows Bell-theorem-violating correlations at a distance to coexist with locality in the…

### An Introduction to Many Worlds in Quantum Computation

- Physics
- 2008

It is found that using this particular many-worlds theory as a physical foundation for quantum computation gives several distinct advantages over other interpretations, and over not interpreting quantum theory at all.

### Preferred basis, decoherence and a quantum state of the Universe

- Physics
- 2020

We review a number of issues in foundations of quantum theory and quantum cosmology including, in particular, the problem of the preferred basis in the many-worlds interpretation of quantum…

### A Brief Overview of the Leading Interpretations of Quantum Mechanics

- Physics
- 2021

This article attempts to present brief outlines of the leading interpretations of quantum mechanics. Many-worlds, relational, von Neumann–Wigner, Copenhagen and hidden variable are examined.…

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