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Quantitative preparation-tail and waiting-time condition
Statement
Use the normalized kernel and correlation-moment lemma under their hypotheses. Assume countable choice for the scalar change-of-variables theorem used below. Fix an integer and put , with spectral operator norm . Let be the space of complex-linear maps , with induced norm . Fix . Assume that is strongly measurable on with respect to Lebesgue measure, and that almost everywhere there. Retain the convolution hypothesis of the moment lemma. Then the preparation-tail map exists as a Bochner integral in and obeys .
For any density operator on , identified with its matrix in the standard orthonormal basis, and any , the condition implies .
Facts & Assumptions
The normalization lemma defines and . ULE kernel adjoint symmetry and rate identities
Under the convolution premise, the nonnegative measurable function satisfies . A first-moment bound for the bath correlation convolution
A real or complex normed space with an ordered finite basis is Banach. The space above has the coordinate maps that send one standard matrix unit to one standard matrix unit and all other matrix units to zero as an ordered basis. Every finite-dimensional normed space is Banach
Strong measurability means almost-everywhere norm convergence of measurable simple functions. A Bochner integral is the norm limit of the integrals of integrable simple approximants converging in . Strongly measurable Banach-valued function Bochner-integrable function
For a strongly measurable Banach-valued function , finiteness of is equivalent to Bochner integrability, and . Bochner integrability criterion Bochner integral norm inequality
A density operator on a nonzero finite-dimensional complex inner-product space is a non-negative endomorphism of trace one; in an orthonormal basis its matrix is Hermitian positive semidefinite. Density operator
The nonnegative integral is monotone and positively homogeneous. Under countable choice, a diffeomorphism between open subsets of Euclidean space satisfies for nonnegative Lebesgue measurable . Monotonicity and nonnegative homogeneity of the nonnegative integral A C¹ diffeomorphism satisfies the change-of-variables formula for nonnegative Lebesgue measurable functions
A normal endomorphism of a finite-dimensional complex inner-product space admits an orthonormal eigenbasis. Complex spectral theorem: a normal endomorphism of a finite-dimensional complex inner product space has an orthonormal eigenbasis, and conversely
Assume countable choice: every sequence of nonempty sets has a choice function. It is used here in the scalar change-of-variables supplier in [F7]. The Axiom of Countable Choice (AC_ω)
Proof
Given: The stated kernel, correlation and strong-measurability hypotheses, countable choice, and . Goal: Establish existence of the tail map and both quantitative bounds.
Apply [F7] to from to ; it is a diffeomorphism with . Endpoints have Lebesgue measure zero. Domination, substitution and monotonicity therefore give , using for . The norm integrand is measurable up to a null set by strong measurability, as in [F5].
By [F3], is Banach. Strong measurability and the finite norm integral in step 1.1 allow [F5] to be applied in , so the Bochner integral defining exists in the sense of [F4]. Its norm is at most .
By [F6], is Hermitian positive semidefinite with trace one. Apply [F8] to this normal matrix. Its eigenvalues are nonnegative, since its quadratic form on a unit eigenvector is , and their sum is its trace, namely one. Thus . For a vector with coordinates in the orthonormal eigenbasis, , giving . By the induced map norm, . If , this is at most , also when . This bounds the stated transient map and does not assert a uniform bound between evolved trajectories.
Depends on
- ULE kernel adjoint symmetry and rate identities
- A first-moment bound for the bath correlation convolution
- Every finite-dimensional normed space is Banach
- Strongly measurable Banach-valued function
- Bochner-integrable function
- Bochner integrability criterion
- Bochner integral norm inequality
- Density operator
- Complex spectral theorem: a normal endomorphism of a finite-dimensional complex inner product space has an orthonormal eigenbasis, and conversely
- Monotonicity and nonnegative homogeneity of the nonnegative integral
- A C¹ diffeomorphism satisfies the change-of-variables formula for nonnegative Lebesgue measurable functions
- The Axiom of Countable Choice (AC_ω)
Dependency tree · 2 levels
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