It is shown in this article that the statistical character of the nonrelativistic, one particle quantum probabilities can be inferred from the function which results from the Wigner transformation on the field operator ψ̂†(x⃗) which, in turn, must be expressed in the occupation number representation. The function which results from the Wigner transformation is shown to be the state function of a single particle which is defined in the conventional quantum mechanics. The integral of the norm squared of that function is proven to be unity which is the step that proves the Max Born hypothesis. The compatibility of the expression for the field amplitude, obtained here, with the measurability of the Bosonic and the Fermionic fields is explained.
It is shown in this article that the statistical character of the nonrelativistic, one particle quantum probabilities can be inferred from the function which results from the Wigner transformation on the field operator ψ̂†(x⃗) which, in turn, must be expressed in the occupation number representation. The function which results from the Wigner transformation is shown to be the state function of a single particle which is defined in the conventional quantum mechanics. The integral of the norm squared of that function is proven to be unity which is the step that proves the Max Born hypothesis. The compatibility of the expression for the field amplitude, obtained here, with the measurability of the Bosonic and the Fermionic fields is explained.
In order to make the quantum mechanics a closed theory one has to derive the Born rule from the first principles, like the Schroedinger equation (SEq), rather than postulate it. The Born rule was in certain sense derived in several articles, e.g. in [1] and [2]. In this work some arguments of previous authors are simplified and made more “physical”. It is shown how to derive the Born rule using the conservation of quantum state norm (Ψ|Ψ) that is the unitary evolution property determined by the SEq. It is this property that makes the probability equal to the square of the amplitude modulus. Possible modification of the Born rule is briefly discussed in the case when the evolution of the system is described by a nonlinear Schroedinger equation. We also present arguments in the spirit of the Many-World Interpretation to explain the origin of probabilistic behavior. Simply speaking, the randomness appears as a result of representing the wave function by using a detector of discrete nature that is found only in one state at a time, out of two or more possible states.
Abstract The purpose of this article is to construct an explicit relation between the field operators in Quantum Field Theory and the relevant operators in Quantum Mechanics for a system of N identical particles, which are the symmetrised functions of the canonical operators of position and momentum, thus providing a clear relation between Quantum Field Theory and Quantum Mechanics. This is achieved in the context of the non-interacting Klein–Gordon field. Though this procedure may not be extendible to interacting field theories, since it relies crucially on particle number conservation, we find it nevertheless important that such an explicit relation can be found at least for free fields. It also comes out that whatever statistics the field operators obey (either commuting or anticommuting), the position and momentum operators obey commutation relations. The construction of position operators raises the issue of localizability of particles in Relativistic Quantum Mechanics, as the position operator for a single particle turns out to be the Newton–Wigner position operator. We make some clarifications on the interpretation of Newton–Wigner localized states and we consider the transformation properties of position operators under Lorentz transformations, showing that they do not transform as tensors, rather in a manner that preserves the canonical commutation relations. From a complex Klein–Gordon field, position and momentum operators can be constructed for both particles and antiparticles.
The Born’s rule to interpret the square of wave function as the probability to get a specific value in measurement has been accepted as a postulate in foundations of quantum mechanics. Although there have been so many attempts at deriving this rule theoretically using different approaches such as frequency operator approach, many-world theory, Bayesian probability and envariance, literature shows that arguments in each of these methods are circular. In view of absence of a convincing theoretical proof, recently some researchers have carried out experiments to validate the rule up-to maximum possible accuracy using multi-order interference (Sinha et al, Science, 329, 418 [2010]). But, a convincing analytical proof of Born’s rule will make us understand the basic process responsible for exact square dependency of probability on wave function. In this paper, by generalizing the method of calculating probability in common experience into quantum mechanics, we prove the Born’s rule for statistical interpretation of wave function.
All “interpretations” of Quantum Mechanics (QM) are predicated on the assumption that quantum mathematics is correct. We disagree. The Born rule implies that nature may have a hidden symmetry: |+ψ|2 = |–ψ|2 = probability. If nature uses –ψ then physicists would not recognize that their math is 100% wrong. This hypothesis could explain the mystery that quantum math appears to be the most accurate and productive mathematics humans ever possessed, the source of our high-tech economy, yet scientists cannot agree on what the quantum world is like: does it exist, are there infinitely many worlds, etc. If we change our wave-function from +ψ to –ψ, that will mean that quantum particles follow zero-energy “Elementary Waves” backwards. This symmetry does not conform to Noether’s Theorem because it does not involve physical space, rather an error in the human imagination. Wave-function collapse no longer occurs when a quantum particle is observed. It occurs when a free particle is emitted: when the particle selects which in-coming Elementary Wave to follow backwards. This undermines the foundations of the many-worlds theory. A superposition of states collapses as a particle is emitted, becoming only one state, located in only one world, not many. Type (Method/Approach): No one previously recognized the Born rule could hide a “Born Symmetry”: |+ψ|2 ≡ |–ψ|2. If so, it would be so immense, pervasive, insidious, and invisible that it could explain all quantum “weirdness” even though quantum math is the most accurate and productive science ever.
A derivation of the statistical nature of quantum probabilities is presented by considering a system of bosonic particles in a coherent state. A comparison between the current approach and a former derivation is also discussed. The current approach, which is an evaluation of the field operator matrix in the coherent Glauber state, proved to be a concise method which can be applied to relativistic particles as well. An extension of the coherent state method to the fermionic type of particles is also presented and thus the generality of the coherent state method is established.
Unity Survives Distinction develops a structural interpretation of the Born rule as the quadratic law by which the unity of a quantum state is preserved across operational distinction. For a normalized state |ψ⟩ and a complete projective measurement {Π_j}, Hilbert-space Pythagoras gives: 1 = ||ψ||² = Σ_j ||Π_jψ||² = Σ_j ⟨ψ|Π_j|ψ⟩ The Born weights are therefore not merely numerical assignments attached to outcomes. They are the non-negative quadratic quantities through which the norm of one complex state is distributed across an exhaustive family of orthogonal alternatives without loss of totality. The paper extends this structure to compatible nested refinements and generalized measurements. Under refinement, probability closure is preserved through the zero-residual identity: P_α = Σ_k P_αk For a generalized measurement effect E, the same internal quadratic structure is expressed as: P(E) = ⟨ψ|E|ψ⟩ = ||E^(1/2)ψ||² The paper distinguishes this quantum claim from ordinary classical additivity. Additivity alone is measure-theoretic and is not uniquely quantum. The specifically quantum architecture lies in the conjunction of complex amplitudes, conjugate quadratic form, global-phase invariance, interference-sensitive recombination, operator-defined measurement contexts, and exact preservation of the total norm. Gleason’s theorem and related results for effects and positive operator-valued measures are used to explain why, under standard noncontextual additivity assumptions, the trace form of quantum probability is essentially forced rather than arbitrarily selected. Within the ENSO framework, this structure is formulated as Born intrinsic closure: fixed unity, zero refinement residual, and an internal quadratic witness. The paper does not claim a new formula for the Born rule, a new proof of Gleason’s theorem, or a derivation of Hilbert space from pre-quantum principles. It develops the structural and interpretive significance of established quantum mathematics. Its central conclusion is: The Born rule is the quadratic law by which unity survives distinction.