In quantum mechanics (and computation), a weak value is a quantity related to a shift of a measuring device's pointer when usually there is pre- and postselection. It should not be confused with a weak measurement, which is often defined in conjunction. The weak value was first defined by Yakir Aharonov, David Albert, and Lev Vaidman, published in Physical Review Letters 1988,[1] and is related to the two-state vector formalism. There is also a way to obtain weak values without postselection.[2][3]
- ^ Yakir Aharonov; David Z. Albert; Lev Vaidman (1988). "How the result of a measurement of a component of the spin of a spin-1/2 particle can turn out to be 100". Physical Review Letters. 60 (14): 1351–1354. Bibcode:1988PhRvL..60.1351A. doi:10.1103/PhysRevLett.60.1351. PMID 10038016.
- ^ Abbott, Alastair A.; Silva, Ralph; Wechs, Julian; Brunner, Nicolas; Branciard, Cyril (2019). "Anomalous Weak Values Without Post-Selection". Quantum. 3: 194. arXiv:1805.09364. Bibcode:2019Quant...3..194A. doi:10.22331/q-2019-10-14-194. S2CID 119466052.
- ^ Nirala, Gaurav; Sahoo, Surya Narayan; Pati, Arun K.; Sinha, Urbasi (2019-02-13). "Measuring average of non-Hermitian operator with weak value in a Mach-Zehnder interferometer". Physical Review A. 99 (2): 022111. arXiv:1807.09014. Bibcode:2019PhRvA..99b2111N. doi:10.1103/PhysRevA.99.022111. ISSN 2469-9926. S2CID 118982020.