An attempt to understand relational quantum mechanics

Lahti, Pekka; Pellonpää, Juha-Pekka

doi:10.48550/arxiv.2207.01380

Cited by 2 publications

(3 citation statements)

References 44 publications

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“…Rovelli labeled this preservation of intersubjectivity 'Cross-Perspective Link'. A recent detailed critique of this purported "fix" can however be found in [31] by Lahti and Pellonpää.…”

Section: Rovelli S Relational Interpretation-mwi In Disguise?mentioning

confidence: 99%

“…They respond that "this is a new independent assumption and it appears to be incompatible with the preceding ideas trying to exhibit the assumption (of RQM)" and "without assuming that the postulate of cross-perspective links holds also in this case, the conclusion that we all 'see the same world' is still unjustified." [31].…”

Section: Rovelli S Relational Interpretation-mwi In Disguise?mentioning

confidence: 99%

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Defending Many Worlds via Case Discrimination: An Attempt to Showcase the Conceptual Incoherence of Anti-Realist Interpretations and Relational Quantum Mechanics

Huber

2023

Quantum Reports

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In this work, an alternative attempt to motivate the Many-Worlds Interpretation (MWI) is undertaken. The usual way of arguing for MWI mostly revolves around how it might solve the measurement problem in a more straightforward and concise manner than rival interpretations. However, here an effort is made to defend MWI in an indirect manner, namely via repeated case discrimination and a process of ‘conceptual elimination’. That is, it will be argued that its major rivals, with QBism and Relational Quantum-Mechanics being among the most noteworthy ones, either face conceptual incoherence or conceptually collapse into a variant of MWI. Finally, it is argued that hidden-variable theories face severe challenges when being applied to Quantum Field Theory such that appropriate modifications may lead back to MWI, thereby purportedly leaving MWI as the only viable option.

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“…Rovelli labeled this preservation of intersubjectivity 'Cross-Perspective Link'. A recent detailed critique of this purported "fix" can however be found in [31] by Lahti and Pellonpää.…”

Section: Rovelli S Relational Interpretation-mwi In Disguise?mentioning

confidence: 99%

Section: Rovelli S Relational Interpretation-mwi In Disguise?mentioning

confidence: 99%

Defending Many Worlds via Case Discrimination: An Attempt to Showcase the Conceptual Incoherence of Anti-Realist Interpretations and Relational Quantum Mechanics

Huber

2023

Quantum Reports

View full text Add to dashboard Cite

show abstract

“…Lahti and Pelonpää have recently argued that the "cross-perspective link" postulate is "a disguised form of the projection postulate leading to a 'global collapse' of the state of the interacting pair" [21]. This conclusion is difficult to dodge.…”

mentioning

confidence: 99%

The De-Relationalizing of Relational Quantum Mechanics

Stacey¹

2022

Preprint

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A recent phase transition in the relational interpretation of quantum mechanics (RQM) is situated in its historical context, and the novelty of the post-transition viewpoint is questioned.Relational Quantum Mechanics (RQM) is an approach to interpreting quantum theory first proposed by Rovelli in the Before Times [1]. Recently, RQM has been critiqued by several authors [2][3][4][5][6][7]. Perhaps in response to some of these critiques, Adlam and Rovelli published a significant revision to RQM which, in so many words, backs away from the relationalism that had characterized the interpretation [8]. The change can be illustrated by a thought-experiment in the vein of Wigner's Friend, or the "observer observed". Bob stands outside a room, which he believes to contain Alice and a system, e.g., a qubit. We can contemplate two different kinds of consistency conditions regarding this scenario. Suppose that Bob can measure either Alice, the qubit, or both in succession. Bob might ask Alice, "What did you get when you measured the qubit in the σ z basis?" He might then expect that if he measures the qubit in the σ z basis himself, he will get the same answer that he heard from Alice. This is a first-person consistency condition: It is phrased entirely in terms of what Bob experiences and expects. We can also imagine a third-person kind of consistency, which is not about Bob's sense data, but rather about facts generally available. A third-person consistency condition might say that Alice's measurement outcome is a factfor-all, and Bob is guaranteed to get the same value if he performs the same measurement. Previously, Rovelli had endorsed a premise of Relativity of comparisons: it is meaningless to compare the accounts relative to any two systems except by invoking a third system relative to which the comparison is made.

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An attempt to understand relational quantum mechanics

Cited by 2 publications

References 44 publications

Defending Many Worlds via Case Discrimination: An Attempt to Showcase the Conceptual Incoherence of Anti-Realist Interpretations and Relational Quantum Mechanics

Defending Many Worlds via Case Discrimination: An Attempt to Showcase the Conceptual Incoherence of Anti-Realist Interpretations and Relational Quantum Mechanics

The De-Relationalizing of Relational Quantum Mechanics

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