---
title: "Lev Vaidman"
type: "entity"
entity_kind: "person"
status: "hub"
canonical_name: "Lev Vaidman"
aliases: []
first_seen: "2026-10-23T00:00:00.000Z"
writer_model: "claude-sonnet-5"
connects_to: ["weak value","two-state vector formalism","protective measurement","Yakir Aharonov","quantum foundations"]
seek_code_commit: "d40ee39"
---


Israeli theoretical physicist, longtime collaborator of [[entity-yakir-aharonov|Yakir Aharonov]] and co-developer of the [[entity-weak-value|weak-value]] concept (Aharonov, Albert & Vaidman, 1988), the [[entity-two-state-vector-formalism|two-state vector formalism]], and protective measurement (with Aharonov, 1993). In the vault he anchors the formal apparatus — pre- and post-selection and weak values — underlying both Aharonov's 1988 "spin can turn out to be 100" result and the 2016 quantum pigeonhole principle.

## References
- [[claim-aharonov-1988-weak-value-origin-disturbance-scales-epsilon-squared]]