Bulletin of the American Physical Society
2021 Annual Meeting of the APS Four Corners Section
Volume 66, Number 11
Friday–Saturday, October 8–9, 2021; Virtual; Mountain Daylight Time
Session E04: AMO and Quantum Information II |
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Chair: T.-C. Shen, Utah State University |
Friday, October 8, 2021 3:15PM - 3:39PM |
E04.00001: Perspectives of quantum computing with magnons Invited Speaker: Dmytro Bozhko Finding new ways for fast and efficient processing and transfer of data is one of the most challenging tasks nowadays. One of the most challenging directions in this area is quantum computing, which is up to now dominated by superconducting circuits. Although such circuits are assumed to be well scalable, creating large quantum networks of multiple quantum bits is still a major problem. Thus, it is very important to look for other physical systems, which might become companions or even replacements for the current superconducting computing elements. Another challenge is to connect these systems to conventional superconducting circuits. One of the possible solutions might come from the investigation of magnetic systems and quasiparticles associated with the elementary disturbance of magnetic order -- magnons. Large tunability, relatively long lifetimes of excitations, intrinsic nonlinearities, excellent ability to connect to other physical systems and easy creation of macroscopic quantum states like magnon Bose-Einstein Condensate (BEC) -- these are some of the main features, which might be used for the advancement of quantum computing. In this talk, I will summarize the main achievements in the field of quantum magnonics. Firstly, the creation and manipulation of magnon BECs will be discussed. Secondly, the coherent coupling of magnon states to superconducting circuits will be reviewed. And finally, I will present a recently developed heralded single magnon source concept. Reported here works were funded in part by ERC within the AdG ``Supercurrents of Magnon Condensates for Advanced Magnonics'', Alexander von Humboldt Foundation, and UCCS Office of Research CRCW Seed Grant. [Preview Abstract] |
Friday, October 8, 2021 3:39PM - 3:51PM |
E04.00002: Expressing the Dynamics of a Quantum Szilard Engine Using Quantum Information Sergio Diaz, Jean-Fran\c{c}ois Van Huele Quantum information offers the possibility of advancing computation, communication, and cryptography. Quantum circuits combine qubits and quantum gates to perform informational tasks. Quantum resources allow quantum computers to perform certain tasks faster than classical computers. Szilard expanded on Maxwell`s demon to design a single-temperature engine that challenges the second law of thermodynamics by extracting work from information. In doing so, Szilard brought together thermodynamics, information theory, and computation. We are interested in the quantum version of the Szilard engine, which we model following Zurek \footnote{W. H. Zurek, Physics Reports 755, 1 (2018)} and Davies \footnote{P. Davies et al., (2020), arXiv:2011.01180 [quant-ph]}. By considering a box containing a single particle, partitioning the box, measuring occupancy, and moving the boundaries of the box, we reproduce the steps of the Szilard engine as a quantum mechanical problem. We analyze the dependence of the solutions on the parameters of the boxes. We also determine thermodynamic quantities describing the evolution of our quantum system during one cycle of the Szilard engine, demonstrating how the demon violates the second law of thermodynamics and how it must be treated as its own quantum system. [Preview Abstract] |
Friday, October 8, 2021 3:51PM - 4:03PM |
E04.00003: Loss-tolerant photonic cluster state generation for one-way quantum repeaters Yuan Zhan, Shuo Sun By encoding qubits into specific types of photonic cluster states, one can realize one-way quantum repeaters that enable fast entanglement distribution rate approaching classical communication. However, the generation of these photonic cluster states requires a formidable resource overhead using traditional approaches based on linear optics and fast feedforward. To overcome this challenge, we propose a scheme to deterministically generate tree-like photonic cluster states with a single quantum emitter [1]. Photonic entanglement is established through both emission and re-scattering from the same emitter, enabling fast and resource-efficient entanglement generation. In addition, we quantitatively analyze the one-way repeater performance based on the repeater graph states and the tree states, respectively. We compare the performance between our generation scheme and previous works using ancillary quantum memories, and identify the optimal scheme at different system parameters. Our results constitute an important scheme for loss-tolerant photonic cluster state generation with feasible resources, and lay out the parameter requirements for future experimental realizations of one-way quantum repeaters. [1] Y. Zhan and S. Sun, Phys. Rev. Lett. 125, 223601 (2020) [Preview Abstract] |
Friday, October 8, 2021 4:03PM - 4:15PM |
E04.00004: Are Complex Numbers Needed in Quantum Mechanics ? Thomas Hoffman SINCE THE APPEARANCE OF QUANTUM MECHANICS, COMPLEX NUMBERS HAVE PLAYED A FUNDAMENTAL ROLE IN THE THEORY. IN CONTRAST, THE USE OF COMPLEX NUMBERS IN CLASSICAL PHYSICS IS A MATTER OF CHOICE, NOT A NECESSITY. PHYSICISTS HAVE ATTEMPTED TO FORMULATE A VERSION OF QUANTUM MECHANICS WITHOUT COMPLEX NUMBERS TO CAPTURE THE QUANTUM PROPERTIES WITH REAL NUMBERS ONLY. I WILL PRESENT DIFFERENT VIEWPOINTS THAT ARGUE THAT COMPLEX NUMBERS ARE NECESSARY AS WELL AS ATTEMPTS TO DEVELOP PURELY REAL THEORIES. IN PARTICULAR, I WILL DISCUSS A SPECIFIC EXPERIMENTAL PROPOSAL THAT CHALLENGES US TO SETTLE THE ISSUE IN A QUANTIFIABLE MANNER. [Preview Abstract] |
Friday, October 8, 2021 4:15PM - 4:27PM |
E04.00005: Quantum Teleportation in the Age of Physical Quantum Networks Aidan Gillam, Jean-Francois Van Huele A powerful example of current quantum technology is quantum teleportation, a process that allows an unknown quantum state to be communicated from one location to another. I discuss theoretical quantum teleportation involving the sharing of a maximally entangled pair of qubits and the sending of two bits of classical information. I show how teleportation is expressed in the language of quantum circuitry. I then address complications relating to the physical implementation of teleportation within quantum networks. I conclude by discussing exciting developments and new teleportation schemes that seek to address these issues. [Preview Abstract] |
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