Christopher A. Fuchs
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View article: Quantum Dynamics Happens Only on Paper: QBism's Account of Decoherence
Quantum Dynamics Happens Only on Paper: QBism's Account of Decoherence Open
QBism has long recognized quantum states, POVM elements, Kraus operators, and even unitary operations to be cut from the same cloth: They express aspects of an agent's belief system concerning the consequences (for her) of actions she migh…
View article: QBism, Where Next?
QBism, Where Next? Open
This paper expresses what a breath of fresh air it has been since a few phenomenological philosophers have started to engage with QBism. In service of the newfound discussion, the aim of this exposition is to lay out the structure of QBism…
View article: Quantum mechanics? It's all fun and games until someone loses an $i$
Quantum mechanics? It's all fun and games until someone loses an $i$ Open
QBism regards quantum mechanics as an addition to probability theory. The addition provides an extra normative rule for decision-making agents concerned with gambling across experimental contexts, somewhat in analogy to the double-slit exp…
View article: Letters for Andrei: QBism and the Unfinished Nature of Nature
Letters for Andrei: QBism and the Unfinished Nature of Nature Open
From the Text: How shall I tribute Andrei Khrennikov in this volume? With an email collection of course! But with what theme? It ought to be something big. One of the troubles of QBism's ontological program is that it is so sideways to the…
View article: Born's rule as a quantum extension of Bayesian coherence
Born's rule as a quantum extension of Bayesian coherence Open
The subjective Bayesian interpretation of probability asserts that the rules\nof the probability calculus follow from the normative principle of Dutch-book\ncoherence: A decision-making agent should not assign probabilities such that a\nse…
View article: QBians Do Not Exist
QBians Do Not Exist Open
We remark on John Earman's paper ``Quantum Bayesianism Assessed'' [The Monist 102 (2019), 403--423], illustrating with a number of examples that the quantum ``interpretation'' Earman critiques and the interpretation known as QBism have alm…
View article: The varieties of minimal tomographically complete measurements
The varieties of minimal tomographically complete measurements Open
Minimal Informationally Complete quantum measurements, or MICs, illuminate the structure of quantum theory and how it departs from the classical. Central to this capacity is their role as tomographically complete measurements with the fewe…
View article: Reviews of quantum foundations
Reviews of quantum foundations Open
DiVincenzo and Fuchs reply: We deeply regret our oversight of Leslie Ballentine’s influential 1970 Reviews of Modern Physics article on the ensemble interpretation. We were well aware of the paper but had not realized that it appeared in R…
View article: Symmetric informationally complete measurements identify the irreducible difference between classical and quantum systems
Symmetric informationally complete measurements identify the irreducible difference between classical and quantum systems Open
We describe a general procedure for associating a minimal\ninformationally-complete quantum measurement (or MIC) and a set of linearly\nindependent post-measurement quantum states with a purely probabilistic\nrepresentation of the Born Rul…
View article: Are Non-Boolean Event Structures the Precedence or Consequence of Quantum Probability?
Are Non-Boolean Event Structures the Precedence or Consequence of Quantum Probability? Open
In the last five years of his life Itamar Pitowsky developed the idea that the formal structure of quantum theory should be thought of as a Bayesian probability theory adapted to the empirical situation that Nature's events just so happen …
View article: Quantum foundations
Quantum foundations Open
More than a century after the birth of quantum mechanics, physicists and philosophers are still debating what a “measurement” really means.
View article: Analysis and Synthesis of Minimal Informationally Complete Quantum Measurements
Analysis and Synthesis of Minimal Informationally Complete Quantum Measurements Open
Minimal Informationally Complete quantum measurements, or MICs, illuminate the structure of quantum theory and how it departs from the classical. We establish general properties of MICs, explore constructions of several classes of them, an…
View article: What is Real? The Unfinished Quest for the Meaning of Quantum Physics
What is Real? The Unfinished Quest for the Meaning of Quantum Physics Open
First Page
View article: Copenhagen Interpretation Delenda Est?
Copenhagen Interpretation Delenda Est? Open
This is a slightly extended version of a review of Adam Becker's book What is Real? The Unfinished Quest for the Meaning of Quantum Physics, to appear in American Journal of Physics. The key addition is the reference list.
View article: The SIC Question: History and State of Play
The SIC Question: History and State of Play Open
Recent years have seen significant advances in the study of symmetric informationally complete (SIC) quantum measurements, also known as maximal sets of complex equiangular lines. Previously, the published record contained solutions up to …
View article: Notwithstanding Bohr, the Reasons for QBism
Notwithstanding Bohr, the Reasons for QBism Open
Without Niels Bohr, QBism would be nothing. But QBism is not Bohr. This paper attempts to show that, despite a popular misconception, QBism is no minor tweak to Bohr's interpretation of quantum mechanics. It is something quite distinct. Al…
View article: QBism: Quantum Theory as a Hero's Handbook
QBism: Quantum Theory as a Hero's Handbook Open
This paper represents an elaboration of the lectures delivered by one of us (CAF) during "Course 197 -- Foundations of Quantum Physics" at the International School of Physics "Enrico Fermi" in Varenna, Italy, July 2016. Much of the materia…
View article: On Participatory Realism
On Participatory Realism Open
In the Philosophical Investigations, Ludwig Wittgenstein wrote, " 'I' is not the name of a person, nor 'here' of a place, .... But they are connected with names. ... [And] it is characteristic of physics not to use these words." This state…
View article: Rate-loss analysis of an efficient quantum repeater architecture
Rate-loss analysis of an efficient quantum repeater architecture Open
We analyze an entanglement-based quantum key distribution (QKD) architecture that uses a linear chain of quantum repeaters employing photon-pair sources, spectral-multiplexing, linear-optic Bell-state measurements, multi-mode quantum memor…
View article: Reading QBism: A Reply to Nauenberg
Reading QBism: A Reply to Nauenberg Open
This is a reply to Michael Nauenberg's arXiv:1502.00123, to be published in the American Journal of Physics, in which he comments critically on our paper "An introduction to QBism with an application to the locality of quantum mechanics", …