Genuine Continuous Quantumness

• URL: http://arxiv.org/abs/2503.07574v1
• Date: Mon, 10 Mar 2025 17:41:35 GMT
• Title: Genuine Continuous Quantumness
• Authors: Vojtěch Kala, Jiří Fadrný, Michal Neset, Jan Bílek, Petr Marek, Miroslav Ježek,
• Abstract summary: We introduce nonlinear squeezing as a general framework to describe and verify genuine quantumness in noise of continuous quantum states.<n>We certify the non-Gaussianity of experimentally prepared multi-photon-added coherent states of light for the first time.<n>This framework advances quantum science and supports the development of quantum technologies.
• Score: 0.5277756703318045
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Randomness is a key feature of quantum physics. Heisenberg's uncertainty principle reveals existence of an intrinsic noise, usually explored through Gaussian squeezed states. Due to their insufficiency for quantum advantage, the focus is currently shifting towards genuinely quantum non-Gaussian states. However, while the genuine quantum behavior comes naturally to discrete variable systems, its preparation and verification is difficult in the continuous ones. Simultaneously, a unifying theoretical framework based on the continuous nature is missing. Here, we introduce nonlinear squeezing as a general framework to describe and verify genuine quantumness in noise of continuous quantum states. Using this approach, we certify the non-Gaussianity of experimentally prepared multi-photon-added coherent states of light for the first time. Chiefly, we demonstrated the nonlinear squeezing corresponding to third- and fifth-order quantum nonlinearities, going significantly beyond the current state-of-the-art in quantum technology. This framework advances quantum science and supports the development of quantum technologies by uncovering intricate quantum properties in cutting-edge experiments.

Related papers

• Beyond Spin: Torsion-Driven Nonlinearity in Spinless Quantum Mechanics [0.0]
  We investigate the previously unexplored quantum dynamics of non-relativistic, spinless particles propagating in curved spaces with torsion. Our results reveal a previously unrecognized mechanism by which torsion, as predicted in certain extensions of general relativity, can influence quantum systems.
  arXiv  Detail & Related papers  (2025-04-13T19:13:35Z)
• Ultrafast quantum light uncertainty dynamics in real time [0.0]
  We extend quantum optics into the ultrafast regime, providing direct experimental evidence that quantum uncertainty is not a static constraint.<n>We observe the temporal dynamics of amplitude uncertainty, demonstrating that quantum uncertainty is a controllable and tunable physical quantity.<n>This work paves the way for exploring quantum uncertainty dynamics and establishes the foundation for the emerging field of ultrafast quantum science.
  arXiv  Detail & Related papers  (2024-12-12T02:33:45Z)
• Quantum coarsening and collective dynamics on a programmable quantum simulator [27.84599956781646]
  We experimentally study collective dynamics across a (2+1)D Ising quantum phase transition. By deterministically preparing and following the evolution of ordered domains, we show that the coarsening is driven by the curvature of domain boundaries. We quantitatively explore these phenomena and further observe long-lived oscillations of the order parameter, corresponding to an amplitude (Higgs) mode.
  arXiv  Detail & Related papers  (2024-07-03T16:29:12Z)
• Quantum sensitivity analysis: a general framework for controlling quantum fluctuations [1.4130869932877583]
  We introduce a general new theory which allows us to predict quantum effects in any nonlinear system purely in terms of its classical description. We demonstrate the predictions of our theory in experiments probing quantum fluctuations of intense femtosecond pulses propagating in an optical fiber.
  arXiv  Detail & Related papers  (2023-11-09T17:26:56Z)
• Variational quantum simulation using non-Gaussian continuous-variable systems [39.58317527488534]
  We present a continuous-variable variational quantum eigensolver compatible with state-of-the-art photonic technology. The framework we introduce allows us to compare discrete and continuous variable systems without introducing a truncation of the Hilbert space.
  arXiv  Detail & Related papers  (2023-10-24T15:20:07Z)
• 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 Thermal State Preparation [39.91303506884272]
  We introduce simple continuous-time quantum Gibbs samplers for simulating quantum master equations. We construct the first provably accurate and efficient algorithm for preparing certain purified Gibbs states. Our algorithms' costs have a provable dependence on temperature, accuracy, and the mixing time.
  arXiv  Detail & Related papers  (2023-03-31T17:29:56Z)
• Quantum Instability [30.674987397533997]
  We show how a time-independent, finite-dimensional quantum system can give rise to a linear instability corresponding to that in the classical system. An unstable quantum system has a richer spectrum and a much longer recurrence time than a stable quantum system.
  arXiv  Detail & Related papers  (2022-08-05T19:53:46Z)
• Driven Gaussian quantum walks [0.0]
  Quantum walks function as essential means to implement quantum simulators. We introduce the notion of a driven Gaussian quantum walk. We study the generation and boost of highly multimode entanglement, squeezing, and other quantum effects.
  arXiv  Detail & Related papers  (2021-12-16T15:53:42Z)
• Quantum non-Gaussianity of multi-phonon states of a single atom [0.7381551917607596]
  We derive the most challenging hierarchy of quantum non-Gaussian criteria for the individual mechanical Fock states. We analyze the depth of quantum non-Gaussian features under mechanical heating and predict their application in quantum sensing.
  arXiv  Detail & Related papers  (2021-11-19T09:58:22Z)
• Probing Topological Spin Liquids on a Programmable Quantum Simulator [40.96261204117952]
  We use a 219-atom programmable quantum simulator to probe quantum spin liquid states. In our approach, arrays of atoms are placed on the links of a kagome lattice and evolution under Rydberg blockade creates frustrated quantum states. The onset of a quantum spin liquid phase of the paradigmatic toric code type is detected by evaluating topological string operators.
  arXiv  Detail & Related papers  (2021-04-09T00:18:12Z)
• Macroscopic randomness for quantum entanglement generation [0.0]
  Quantum entanglement between two or more bipartite entities is a core concept in quantum information areas. This paper presents a pure classical method of on-demand entangled light-pair generation.
  arXiv  Detail & Related papers  (2021-03-04T07:58:49Z)
• Non-equilibrium stationary states of quantum non-Hermitian lattice models [68.8204255655161]
  We show how generic non-Hermitian tight-binding lattice models can be realized in an unconditional, quantum-mechanically consistent manner. We focus on the quantum steady states of such models for both fermionic and bosonic systems.
  arXiv  Detail & Related papers  (2021-03-02T18:56:44Z)
• 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)
• Direct Quantum Communications in the Presence of Realistic Noisy Entanglement [69.25543534545538]
  We propose a novel quantum communication scheme relying on realistic noisy pre-shared entanglement. Our performance analysis shows that the proposed scheme offers competitive QBER, yield, and goodput.
  arXiv  Detail & Related papers  (2020-12-22T13:06:12Z)

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.