Search

Your search keyword '"Gandotra, Aditya"' showing total 4 results
Start Over Author "Gandotra, Aditya"
4 results on '"Gandotra, Aditya"'

1. Systematic time-coarse graining for driven quantum systems

Author

Bello, Leon, Fan, Wentao, Gandotra, Aditya, and Türeci, Hakan E.

Subjects
Quantum Physics
Abstract

Many recent advancements in quantum computing leverage strong drives on nonlinear systems for state preparation, signal amplification, or gate operation. However, the interplay within such strongly driven system introduces multi-scale dynamics that affects the long-time behavior of the system in non-trivial ways that are very difficult to model. Therefore, the analysis of these systems often relies on effective Hamiltonian models that introduce additional nonlinear processes which approximate the long-time dynamics so that highly oscillatory terms may be ignored. However, the removal of such high frequency transitions can only be performed rigorously within a systematic framework of time-coarse graining, which is a fundamentally irreversible operation. This implies that standard approaches with unitary effective models cannot accurately capture the long-time behavior of strongly driven nonlinear quantum systems in general. We introduce a systematic perturbation theory for obtaining the complete non-unitary effective model of the time-coarse grained (TCG) dynamics of a driven quantum system to any order in the coupling strengths. We derive a closed-form analytical formula for both unitary and non-unitary contributions, in the form of an effective Hamiltonian and non-unitary (pseudo-)dissipators. Remarkably, even though the effective theory presumes unitary time evolution at the microscopic level, the time-coarse grained dynamics is found to follow a non-unitary time evolution in general. This occurs even when there is no open heat reservoir for the system to become entangled with or dissipate into. We demonstrate the effectiveness of the new method using several typical models of driven nonlinear systems in superconducting circuits, and show that it generalizes and improves on existing methods by providing more accurate results and explaining phenomena that have not been accounted for.

Published
2024

2. Pre-Natal Diagnosis and Judicial Forums: The Application of Transformative Constitutional Values in the Medical Termination of Pregnancy Act, 1971.

Author

Lakhanpal, Anish and Gandotra, Aditya

Subjects
ABORTION, PRENATAL diagnosis, FORENSIC medicine, HUMAN abnormalities, FORUMS
Abstract

Termination of pregnancies by itself is an extremely sensitive issue and is even characterized as an offence within Sections 312-316 of the Indian Penal Code. However, legally sanctioned exceptions have been created in the Medical Termination of Pregnancy Act, 1971 (hereinafter referred to as the "MTP Act"). Whenever congenital malformations are detected in a foetus, the relaxation of the upper statutory limit set by the MTP Act becomes the subject of intense debate. When the permissible statutory period elapses, writ petitions to judicial forums may become the last refuge of couples who wish to terminate pregnancy. Many experts question the legal legitimacy of such a relaxation since the time limit set by the statute is unambiguously precise with no scope for exceptions save for a few statutory conditions. However, the authors argue that there are certain eventualities in cases like these, which can form a class by itself and which the MTP Act doesn't take into account. The authors shall proffer new medico-legal arguments using broader constitutional values and suggest changes in the MTP Act to keep it in consonance with newer conceptions of 'mental health' and 'reproductive autonomy'. It is stated at the outset that the purpose of this article is to further enrich the medical jurisprudence on pre-natal technologies by using principles of laws discussed in Courtroom decisions. The paper shall provide a critique of the legal insights and Court precedents which have shaped discussions on the legal challenges faced in pregnancy cases where the presence of foetal anomalies forces the parents to make difficult choices regarding the continuation of their pregnancies. It is maintained that the domain of this paper shall be limited to legal principles and decisions pertaining to the Indian jurisdiction. The technical and biological variables behind the causation of genetic disorders shall be beyond the scope of this paper. [ABSTRACT FROM AUTHOR]

Published
2023

Catalog

Books, media, physical & digital resources
See catalog results