Institute of Computer Science AGH and IBM Software Laboratory in Krakow invite to Krakow Quantum Informatics Seminar (KQIS)
•    understand and discuss current problems in quantum informatics,
•    discuss new quantum computing technologies,
•    exchange ideas and research results,
•    integrate information across different research teams,
•    build a community around quantum informatics.
Venue:  via Internet, Webex

Tuesday, 13th of April 2021, 9:30-11:00

Manish Kumar Gupta,  AstroCeNT — Particle Astrophysics Science and Technology Centre – International Research Agenda, Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Warsaw, Poland

Topic: Quantum Computing with Indefinite Causal Order



Our understanding of the physical world deeply relies on the notion that events are ordered according to a time parameter. The event that precedes causes the event that follows. It was recently shown that quantum mechanics can be formulated without reference to time. This new formulation gives rise to a new resource called "Quantum SWITCH".

We first apply this resource to the field of quantum metrology and propose a novel approach to qubit thermometry using a quantum switch, that introduces an indefinite causal order in the probe-bath interaction, to significantly enhance the thermometric precision. We then apply this resource to the field of quantum communication, where we show that information can still be retained when two mutually unbiased quantum measurements are applied sequentially in superposition.


[1] Superposition of causal order as a metrological resource for quantum thermometry, Chiranjib Mukhopadhyay, Manish K. Gupta, Arun Kumar Pati arXiv:1812.07508
[2] Transmitting quantum information by superposing causal order of mutually unbiased measurements. Manish K. Gupta and Ujjwal Sen. arXiv:1909.13125

Bio: Manish Kumar Gupta is a post-doc working in the group of Piotr Gawron, where he is currently working quantum machine learning. He obtained his PhD in Physics from Louisiana State University where he worked on quantum communication.

  • 2 years, 5 months ago