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Proceedings of the Samahang Pisika ng Pilipinas

A comparison of the quantizations and supraquantization of the time of arrival for anharmonic oscillator potential

John Jaykel P. Magadan, Marc Arvie Talavera, Eric A. Galapon

Published May 23, 2019• 0 citations
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Abstract

Time of arrival (TOA) operators for anharmonic oscillator potential are obtained using Weyl, simple-symmetric, Born-Jordan quantization and supraquantization. The quantized TOA operators are compared to determine which is closest to the supraquantized TOA operator. The Wigner transform of the simple symmetric and Born-Jordan quantized diverge while the Weyl-quantized and the supraquantized vanish as the initial point, q, approaches the arrival point, implying that Weyl out of the three is the quantization that gives a TOA operator closest to the supraquantized TOA operator.

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Time of arrival (TOA) operators for anharmonic oscillator potential are obtained using Weyl, simple-symmetric, Born-Jordan quantization and supraquantization. The quantized TOA operators are compared to determine which is closest to the supraquantized TOA operator. The Wigner transform of the simple symmetric and Born-Jordan quantized diverge while the Weyl-quantized and the supraquantized vanish as the initial point, q, approaches the arrival point, implying that Weyl out of the three is the quantization that gives a TOA operator closest to the supraquantized TOA operator.
Born-Jordan quantization is used to obtain the time of arrival operator for the generalized potential. Specifically, the time kernel for the harmonic oscillator potential is calculated and the corresponding eigenfunction and eigenvalues are obtained. One of the eigenfunctions is made to evolve through time using the Schroedinger's equation. The time evolution of the wave function leads to its collapse on the arrival point at the time of arrival. This implies that Born - Jordan quantization gives a legitimate time of arrival operator for harmonic potential.
This work presents quantization of time of arrival functions using generalized Stratonovich-Weyl quantization. We take into account the ordering problems involved, mainly the Born-Jordan and the symmetric ordering schemes. We call attention to the combination of the group theoretic methods usually employed in Weyl quantization with the implementation of different ordering schemes via integral kernel factors. It is possible to, and we do, apply the Pegg-Barnett method to the quantization of time to address physical issues such as boundedness and self-adjointness.
The quantum time of arrival (TOA) problem requires the statistics of measured arrival times given only the initial state of a particle. Following the standard framework of quantum theory, the problem translates into finding an appropriate quantum image of the classical arrival time TC(q,p), usually in operator form T̂. In this paper, we consider the problem anew within the phase space formulation of quantum mechanics. The resulting quantum image is a real-valued and time-reversal symmetric function TM(q,p) in formal series of ℏ2 with the classical arrival time as the leading term. It is obtained directly from the Moyal bracket relation with the system Hamiltonian and is hence interpreted as a Moyal deformation of the classical TOA. We investigate its properties and discuss how it bypasses the known obstructions to quantization by showing the isomorphism between TM(q,p) and the rigged Hilbert space TOA operator constructed in Pablico and Galapon [Eur. Phys. J. Plus 138, 153 (2023)], which always satisfy the time-energy canonical commutation relation for arbitrary analytic potentials. We then examine TOA problems for a free particle and a quartic oscillator potential as examples.
We apply the Born-Jordan and Weyl quantization formulas for polynomials in canonical coordinates to the constants of motion of some examples of the superintegrable 2D anisotropic harmonic oscillator.Our aim is to study the behaviour of the algebra of the constants of motion after the different quantization procedures.In the examples considered, we have that the Weyl formula always preserves the original superintegrable structure of the system, while the Born-Jordan formula, when producing different operators than the Weyl's one, does not.
Previous numerical analyses on the Aharonov-Bohm (AB) operator representing the quantum time-of-arrival (TOA) observable for the free particle have indicated that its eigenfunctions represent quantum states with definite arrival time at the arrival point. In this paper, we give the mathematical proof that this is indeed the case. An essential element of this proof is the consideration of the eigenfunctions of the AB operator with complex eigenvalues. These eigenfunctions can be considered legitimate TOA eigenfunctions because they evolve unitarily to collapse at the arrival point at the time equal to the real part of their eigenvalue. We show that the time-evolved TOA position probability density distribution evaluated at the time equal to the real part of the eigenvalue forms a dirac delta sequence in the limit as the imaginary part of the eigenvalue approaches zero.