Decoherence-Free Subspaces Cannot Prevent the Collapse of Wave Functions

• URL: http://arxiv.org/abs/2402.00112v2
• Date: Sat, 11 May 2024 01:42:18 GMT
• Title: Decoherence-Free Subspaces Cannot Prevent the Collapse of Wave Functions
• Authors: Alfred Li, Herschel A. Rabitz, Benjamin Lienhard,
• Abstract summary: Investigating the limitations surrounding quantum processors is vital for their advancement. One challenge is inadvertent wave function collapse. Decoherence-free subspaces, theoretically capable of mitigating specific non unitary dynamics, present a promising avenue.
• Score: 0.3277163122167434
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Efficacious quantum information processing relies on extended coherence and precise control. Investigating the limitations surrounding quantum processors is vital for their advancement. In their operation, one challenge is inadvertent wave function collapse. Decoherence-free subspaces, theoretically capable of mitigating specific non unitary dynamics, present a promising avenue. However, our study unveils their inability to safeguard against spontaneous wave function collapse. Thus, the spontaneous-collapse rate becomes a critical limiting factor for quantum systems' physical coherence, restricting the options for maintaining coherence to active error correction.

Related papers

• Universal Protection of Quantum States from Decoherence [0.0]
  The Quantum Zeno Effect offers a powerful route to suppress quantum evolution and protect coherence through frequent measurements.<n>Here we introduce a state- and dynamics-independent protection protocol embedding the system in a larger Hilbert space.<n>We experimentally validate the protocol on a quantum optical platform, demonstrating robust preservation of coherence and purity for arbitrary polarization qubits under decoherence.
  arXiv  Detail & Related papers  (2026-02-20T16:32:28Z)
• Generalised fractional Rabi problem [35.18016233072556]
  Fractional quantum dynamics provides a natural framework to capture nonlocal temporal behavior and memory effects in quantum systems.<n>In this work, we analyze the physical consequences of fractional-order quantum evolution using a Green's function formulation based on the Caputo fractional derivative.<n>We find that even in the absence of external driving, the static Hamiltonian term induces non-trivial spin dynamics with damping features directly linked to the fractional temporal nonlocality.
  arXiv  Detail & Related papers  (2025-10-09T12:51:57Z)
• Destructive Interference induced constraints in Floquet systems [0.0]
  We introduce various types of Hilbert space fragmentation that can be realized in driven systems.<n>Our paradigm unifies various types of Hilbert space fragmentation that can be realized in driven systems.
  arXiv  Detail & Related papers  (2025-08-25T18:00:26Z)
• Enhanced quantum frequency estimation by nonlinear scrambling [41.94295877935867]
  We show that dynamically encoding an unknown frequency in a nonlinear quantum electromagnetic field can significantly improve frequency estimation.<n>We quantify this effect using the Wigner-Yanase skew information, which measures the degree of noncommutativity in the Hamiltonian structure.
  arXiv  Detail & Related papers  (2025-03-03T19:00:01Z)
• 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)
• A Method Using Photon Collapse and Entanglement to Transmit Information [13.438312709072457]
  We find that measurements cause quantum wave functions to collapse. By studying the overlooked phenomena of quantum wave function collapse, we find that quantum eigenstate sets may be artificially controlled. We propose an innovative method for direct information transmission utilizing photon wave function collapse and entanglement.
  arXiv  Detail & Related papers  (2024-06-27T13:22:21Z)
• Adapting coherent-state superpositions in noisy channels [0.5999777817331317]
  Quantum non-Gaussian states are crucial for the fundamental understanding of non-linear bosonic systems. We propose an optimal protection of superpositions of coherent states against a sequence of asymmetric thermal lossy channels by suitable squeezing operations.
  arXiv  Detail & Related papers  (2024-06-03T08:00:18Z)
• Hysteresis and Self-Oscillations in an Artificial Memristive Quantum Neuron [79.16635054977068]
  We study an artificial neuron circuit containing a quantum memristor in the presence of relaxation and dephasing. We demonstrate that this physical principle enables hysteretic behavior of the current-voltage characteristics of the quantum device.
  arXiv  Detail & Related papers  (2024-05-01T16:47:23Z)
• Protecting Hilbert space fragmentation through quantum Zeno dynamics [0.0]
  We show the experimentally feasible viability of quantum Zeno dynamics in the protection of quantum information against thermalization. Our work demonstrates the experimentally feasible viability of quantum Zeno dynamics in the protection of quantum information against thermalization.
  arXiv  Detail & Related papers  (2023-05-10T18:00:02Z)
• 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)
• Protecting the quantum interference of cat states by phase-space compression [45.82374977939355]
  Cat states with their unique phase-space interference properties are ideal candidates for understanding quantum mechanics. They are highly susceptible to photon loss, which inevitably diminishes their quantum non-Gaussian features. Here, we protect these non-Gaussian features by compressing the phase-space distribution of a cat state.
  arXiv  Detail & Related papers  (2022-12-02T16:06:40Z)
• Non-Abelian braiding of graph vertices in a superconducting processor [144.97755321680464]
  Indistinguishability of particles is a fundamental principle of quantum mechanics. braiding of non-Abelian anyons causes rotations in a space of degenerate wavefunctions. We experimentally verify the fusion rules of the anyons and braid them to realize their statistics.
  arXiv  Detail & Related papers  (2022-10-19T02:28:44Z)
• 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)
• Dynamical-decoupling-protected nonadiabatic holonomic quantum computation [0.0]
  Nonadiabatic holonomic quantum computation allows for high-speed implementation of whole-geometric quantum gates. Our protocol not only possesses the intrinsic robustness against control errors but also protects quantum gates against environment-induced decoherence.
  arXiv  Detail & Related papers  (2021-01-14T07:58:15Z)
• Probing coherence and noise tolerance in discrete-time quantum walks: unveiling self-focusing and breathing dynamics [0.0]
  We study the consequences of a short-time (instantaneous) noise while an intensity-dependent phase acquisition is associated with a qubit propagating on $N-cycle. By employing quantum coherence measures, we report emerging unstable regimes in which hitherto unknown quantum walks arise.
  arXiv  Detail & Related papers  (2020-10-28T23:37:59Z)
• Quantum Non-equilibrium Many-Body Spin-Photon Systems [91.3755431537592]
  dissertation concerns the quantum dynamics of strongly-correlated quantum systems in out-of-equilibrium states. Our main results can be summarized in three parts: Signature of Critical Dynamics, Driven Dicke Model as a Test-bed of Ultra-Strong Coupling, and Beyond the Kibble-Zurek Mechanism.
  arXiv  Detail & Related papers  (2020-07-23T19:05:56Z)
• Einselection from incompatible decoherence channels [62.997667081978825]
  We analyze an open quantum dynamics inspired by CQED experiments with two non-commuting Lindblad operators. We show that Fock states remain the most robust states to decoherence up to a critical coupling.
  arXiv  Detail & Related papers  (2020-01-29T14:15:19Z)

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.