Quantum memory in spontaneous emission processes

• URL: http://arxiv.org/abs/2504.08605v1
• Date: Fri, 11 Apr 2025 15:12:14 GMT
• Title: Quantum memory in spontaneous emission processes
• Authors: Mei Yu, Ties-A. Ohst, Hai-Chau Nguyen, Stefan Nimmrichter,
• Abstract summary: We introduce a convex geometric framework to analyze quantum memory propagating in non-Markovian processes.<n>We prove that classical memory between two time points is fundamentally bounded and introduce a robustness measure for quantum memory based on convex geometry.
• Score: 3.6718688941562934
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum memory effects are essential in understanding and controlling open quantum systems, yet distinguishing them from classical memory remains challenging. We introduce a convex geometric framework to analyze quantum memory propagating in non-Markovian processes. We prove that classical memory between two time points is fundamentally bounded and introduce a robustness measure for quantum memory based on convex geometry. This admits an efficient experimental characterization by linear witnesses of quantum memory, bypassing full process tomography. We prove that any memory effects present in the spontaneous emission process of two- and three-level atomic systems are necessarily quantum, suggesting a pervasive role of quantum memory in quantum optics. Giant artificial atoms are discussed as a readily available test platform.

Related papers

• Realizing fracton order from long-range quantum entanglement in programmable Rydberg atom arrays [45.19832622389592]
  Storing quantum information requires battling quantum decoherence, which results in a loss of information over time. To achieve error-resistant quantum memory, one would like to store the information in a quantum superposition of degenerate states engineered in such a way that local sources of noise cannot change one state into another. We show that this platform also allows to detect and correct certain types of errors en route to the goal of true error-resistant quantum memory.
  arXiv  Detail & Related papers  (2024-07-08T12:46:08Z)
• Local disclosure of quantum memory in non-Markovian dynamics [0.0]
  Non-Markovian processes may arise in physics due to memory effects of environmental degrees of freedom. We propose a criterion to test locally for a truly quantum memory.
  arXiv  Detail & Related papers  (2023-10-02T13:47:28Z)
• Quantum Memory: A Missing Piece in Quantum Computing Units [23.256454991183702]
  We provide a full design stack view of quantum memory devices. We review two types of quantum memory devices: random access quantum memory (RAQM) and quantum random access memory (QRAM) Building on top of these devices, quantum memory units in the computing architecture, including building a quantum memory unit, quantum cache, quantum buffer, and using QRAM for the quantum input-output module, are discussed.
  arXiv  Detail & Related papers  (2023-09-25T18:00:08Z)
• Quantum data learning for quantum simulations in high-energy physics [55.41644538483948]
  We explore the applicability of quantum-data learning to practical problems in high-energy physics. We make use of ansatz based on quantum convolutional neural networks and numerically show that it is capable of recognizing quantum phases of ground states. The observation of non-trivial learning properties demonstrated in these benchmarks will motivate further exploration of the quantum-data learning architecture in high-energy physics.
  arXiv  Detail & Related papers  (2023-06-29T18:00:01Z)
• Quantum Optical Memory for Entanglement Distribution [52.77024349608834]
  Entanglement of quantum states over long distances can empower quantum computing, quantum communications, and quantum sensing. Over the past two decades, quantum optical memories with high fidelity, high efficiencies, long storage times, and promising multiplexing capabilities have been developed.
  arXiv  Detail & Related papers  (2023-04-19T03:18:51Z)
• Universality of critical dynamics with finite entanglement [68.8204255655161]
  We study how low-energy dynamics of quantum systems near criticality are modified by finite entanglement. Our result establishes the precise role played by entanglement in time-dependent critical phenomena.
  arXiv  Detail & Related papers  (2023-01-23T19:23:54Z)
• A Quantum-Classical Model of Brain Dynamics [62.997667081978825]
  Mixed Weyl symbol is used to describe brain processes at the microscopic level. Electromagnetic fields and phonon modes involved in the processes are treated either classically or semi-classically. Zero-point quantum effects can be incorporated into numerical simulations by controlling the temperature of each field mode.
  arXiv  Detail & Related papers  (2023-01-17T15:16:21Z)
• Optimal storage capacity of quantum Hopfield neural networks [0.0]
  It is a challenging open problem to analyze quantum associative memories with an extensive number of patterns. We propose and explore a general method for evaluating the maximal storage capacity of quantum neural network models.
  arXiv  Detail & Related papers  (2022-10-14T15:21:21Z)
• High-performance cavity-enhanced quantum memory with warm atomic cell [1.0539847330971805]
  We report a high-performance cavity-enhanced electromagnetically-induced-transparency memory with warm atomic cell. It has been experimentally demonstrated that the average fidelities for a set of input coherent states with different phases and amplitudes within a Gaussian distribution have exceeded the classical benchmark fidelities.
  arXiv  Detail & Related papers  (2022-06-17T01:59:26Z)
• Efficient criteria of quantumness for a large system of qubits [58.720142291102135]
  We discuss the dimensionless combinations of basic parameters of large, partially quantum coherent systems. Based on analytical and numerical calculations, we suggest one such number for a system of qubits undergoing adiabatic evolution.
  arXiv  Detail & Related papers  (2021-08-30T23:50:05Z)
• Imaginary Time Propagation on a Quantum Chip [50.591267188664666]
  Evolution in imaginary time is a prominent technique for finding the ground state of quantum many-body systems. We propose an algorithm to implement imaginary time propagation on a quantum computer.
  arXiv  Detail & Related papers  (2021-02-24T12:48:00Z)
• Quantum Phases of Matter on a 256-Atom Programmable Quantum Simulator [41.74498230885008]
  We demonstrate a programmable quantum simulator based on deterministically prepared two-dimensional arrays of neutral atoms. We benchmark the system by creating and characterizing high-fidelity antiferromagnetically ordered states. We then create and study several new quantum phases that arise from the interplay between interactions and coherent laser excitation.
  arXiv  Detail & Related papers  (2020-12-22T19:00:04Z)
• Single ion-qubit exceeding one hour coherence time [12.541642079269481]
  Long coherence time quantum memory is a major challenge of current quantum technology. We report a single Yb ion-qubit memory with over one hour coherence time.
  arXiv  Detail & Related papers  (2020-08-01T11:47:07Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.