Sub-Bath Cooling in Bosonic Systems: Gaussian Constraints and Non-Gaussian Enhancements

• URL: http://arxiv.org/abs/2512.10703v1
• Date: Thu, 11 Dec 2025 14:41:40 GMT
• Title: Sub-Bath Cooling in Bosonic Systems: Gaussian Constraints and Non-Gaussian Enhancements
• Authors: Wen-Han Png, Xueyuan Hu, Valerio Scarani,
• Abstract summary: We develop a general framework for cooling continuous-variable quantum systems.<n>We identify the constraints imposed by Gaussianity and the advantages enabled by non-Gaussian interactions.<n>Our results establish the fundamental limits of CV heat-bath algorithmic cooling.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Cooling quantum systems with finite resources is a central task in quantum technologies and has been extensively explored in discrete-variable settings. As continuous-variable (CV) platforms play an increasingly important role in quantum information processing, it becomes crucial to understand the fundamental limitations of cooling bosonic systems. In this work, we develop a general framework for cooling CV systems, identifying both the constraints imposed by Gaussianity and the advantages enabled by non-Gaussian interactions. We derive a reachable bound on the cooling performance of Gaussian operations that applies to arbitrary cooling architectures. By optimizing over all protocols saturating this bound, we further identify the most efficient scheme, which minimizes dissipated energy for a given number of ancilla modes. Beyond Gaussian operations, we show that $p$-excitation exchange exploits non-Gaussian resources to achieve a $p$-fold enhancement of the cooling limit. Our results establish the fundamental limits of CV heat-bath algorithmic cooling and reveal the crucial role of non-Gaussianity in surpassing Gaussian cooling barriers.

Related papers

• Exploring Noisy Quantum Thermodynamical Processes via the Depolarizing-Channel Approximation [8.480868309845137]
  We introduce a general framework for approximating the cumulative effect of gate-dependent noise using a global depolarizing channel.<n>We analytically derive its cooling limit in the presence of noise.<n>This approach opens new avenues for exploring noisy quantum thermodynamical processes.
  arXiv  Detail & Related papers  (2026-01-22T20:52:58Z)
• Calibration of Quantum Devices via Robust Statistical Methods [45.464983015777314]
  We numerically analyze advanced statistical methods for Bayesian inference against the state-of-the-art in quantum parameter learning.<n>We show advantages of these approaches over existing ones, namely under multi-modality and high dimensionality.<n>Our findings have applications in challenging quantumcharacterization tasks namely learning the dynamics of open quantum systems.
  arXiv  Detail & Related papers  (2025-07-09T15:22:17Z)
• Optimal absorption and emission of itinerant fields into a spin ensemble memory [39.74150797598488]
  This work focuses on spin-based quantum memories, where itinerant electromagnetic fields are stored in large ensembles.<n>We develop a cascaded quantum model to describe both absorption and emission processes.<n> Numerical simulations are presented in the context of microwave-frequency quantum memories interfaced with superconducting quantum processors.
  arXiv  Detail & Related papers  (2025-06-06T14:16:54Z)
• Designing Minimalistic Variational Quantum Ansatz Inspired by Algorithmic Cooling [0.0]
  This study introduces a novel minimalistic variational quantum ansatz inspired by algorithmic cooling principles.<n>The proposed Heat Exchange algorithmic cooling ansatz (HE ansatz) facilitates efficient population redistribution without requiring bath resets.<n>We also proposed a new variational algorithm that utilize HE ansatz to compute the ground state of impure dissipative-system variational quantum eigensolver.
  arXiv  Detail & Related papers  (2025-01-28T07:59:33Z)
• Cooling limits of coherent refrigerators [0.0]
  We show that quantum systems can be cooled below existing incoherent cooling bounds by employing coherent virtual qubits. We derive universal coherent cooling limits and introduce specific protocols to reach them.
  arXiv  Detail & Related papers  (2024-10-23T18:09:13Z)
• Optimal control in large open quantum systems: the case of transmon readout and reset [44.99833362998488]
  We present a framework that combines the adjoint-state method together with reverse-time backpropagation to solve prohibitively large open-system quantum control problems.<n>We apply this framework to optimize two inherently dissipative operations in superconducting qubits.<n>Our results show that while standard pulses for dispersive readout are nearly optimal, adding a transmon drive during the protocol can yield 2x improvements in fidelity and duration.
  arXiv  Detail & Related papers  (2024-03-21T18:12:51Z)
• Bayesian Optimization through Gaussian Cox Process Models for Spatio-temporal Data [27.922624489449017]
  We propose a novel maximum a posteriori inference of Gaussian Cox processes. We further develop a Nystr"om approximation for efficient computation.
  arXiv  Detail & Related papers  (2024-01-25T22:26:15Z)
• 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)
• Solving Graph Problems Using Gaussian Boson Sampling [22.516585968074146]
  We use a noisy intermediate-scale quantum computer to solve graph problems. We experimentally observe the presence of GBS enhancement with large photon-click number and an enhancement under certain noise. Our work is a step toward testing real-world problems using the existing intermediate-scale quantum computers.
  arXiv  Detail & Related papers  (2023-02-02T08:25:47Z)
• Multi-squeezed state generation and universal bosonic control via a driven quantum Rabi model [68.8204255655161]
  Universal control over a bosonic degree of freedom is key in the quest for quantum-based technologies. Here we consider a single ancillary two-level system, interacting with the bosonic mode of interest via a driven quantum Rabi model. We show that it is sufficient to induce the deterministic realization of a large class of Gaussian and non-Gaussian gates, which in turn provide universal bosonic control.
  arXiv  Detail & Related papers  (2022-09-16T14:18:53Z)
• Taming Quantum Noise for Efficient Low Temperature Simulations of Open Quantum Systems [4.866728358750297]
  We introduce an effective treatment of quantum noise in frequency space by systematically clustering higher order Matsubara poles equivalent to an optimized rational decomposition. This leads to an elegant extension of the HEOM to arbitrary temperatures and very general reservoirs in combination with efficiency, high accuracy and long-time stability. As one highly non-trivial application, for the sub-ohmic spin-boson model at vanishing temperature the Shiba relation is quantitatively verified which predicts the long-time decay of correlation functions.
  arXiv  Detail & Related papers  (2022-02-08T18:46:11Z)
• Quantum cooling activated by coherently-controlled thermalisation [0.0]
  We show that it is possible to boost the heat extraction ability of the ICO fridge by applying N identical thermalising channels in a superposition of N cyclic causal orders. We also provide an experimental simulatable quantum cooling protocol with coherently-controlled thermalising channels.
  arXiv  Detail & Related papers  (2022-01-18T13:18:39Z)
• Quantum Markov Chain Monte Carlo with Digital Dissipative Dynamics on Quantum Computers [52.77024349608834]
  We develop a digital quantum algorithm that simulates interaction with an environment using a small number of ancilla qubits. We evaluate the algorithm by simulating thermal states of the transverse Ising model.
  arXiv  Detail & Related papers  (2021-03-04T18:21:00Z)
• Exponential improvement for quantum cooling through finite-memory effects [0.0]
  We study the effects of memory on quantum cooling. For qubits, our bound coincides with that of heat-bath algorithmic cooling. We describe the adaptive step-wise optimal protocol that outperforms all standard procedures.
  arXiv  Detail & Related papers  (2020-04-01T10:29:10Z)

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.