Stabilizing a single-magnon state by optimizing magnon blockade

• URL: http://arxiv.org/abs/2401.01590v2
• Date: Thu, 25 Jul 2024 01:06:20 GMT
• Title: Stabilizing a single-magnon state by optimizing magnon blockade
• Authors: Zhu-yao Jin, Jun Jing,
• Abstract summary: We consider a hybrid system where a magnon mode is directly coupled to a nonresonant superconducting qubit via the exchange interaction. We find that the single-magnon probability $P_$ can be maximized when the product of the magnon-driving field detuning and the qubit-probing field detuning is equivalent to the square of the magnon-qubit coupling strength.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: A stable and high-quality single-magnon state is desired by the single-magnon source for quantum information application with a macroscopic spin system. We consider a hybrid system where a magnon mode is directly coupled to a nonresonant superconducting qubit via the exchange interaction. The magnon and qubit are under the driving and probing fields with the same frequency, respectively. We find that the single-magnon probability $P_1$ can be maximized when the product of the magnon-driving field detuning and the qubit-probing field detuning is equivalent to the square of the magnon-qubit coupling strength, $\Delta_q\Delta_m=J^2$. Then, the double-magnon probability $P_2$ can be minimized by tuning the ratio of the probing intensity to the driving intensity and the relative phase between the two fields. Under these optimized conditions with accessible strong driving intensity and low decay rate, strong magnon blockade gives rise to a stable single-magnon state with a high quality. It features a large brightness (the single-magnon probability) $P_1\approx0.40$ and a high purity (the equal-time second-order correlation function) $g^{(2)}(0)\sim10^{-5}$. The two indicators as a whole prevail over the existing results for photon, phonon, and magnon modes with respect to a stable single-quantum state. The optimized conditions with a scalable modification $\Delta_q\Delta_m\approx NJ^2$ apply to the situation when one focus on only one of the $N$ magnon modes that are simultaneously coupled to a common qubit.

Related papers

• Magnon cat states in a cavity-magnon-qubit system via two-magnon driving and dissipation [8.932056933014511]
  We propose an efficient method for dissipative generation of magnonic cat states in a cavity-magnon-qubit hybrid system. We find that magnon squeezed states may emerge during the short-time evolution. Magnonic cat and squeezed states are macroscopic quantum states and find applications in macroscopic quantum studies and quantum sensing.
  arXiv  Detail & Related papers  (2025-01-15T09:07:09Z)
• Magnon Blockade with Skyrmion Qubit-Magnon Coupling in a Hybrid Quantum System [12.719202249840517]
  Magnon blockade is a fundamental quantum phenomenon for generating single-magnon state. We propose a theoretical scheme to generate the magnon blockade in a hybrid system consisting of a YIG micromagnet and a skyrmion.
  arXiv  Detail & Related papers  (2024-12-16T01:18:10Z)
• Quantum interference induced magnon blockade and antibunching in a hybrid quantum system [0.0]
  We study the phenomena of quantum interference assisted magnon blockade and magnon antibunching in a weakly interacting hybrid ferromagnet-superconductor system. The magnon excitations in two yttrium iron garnet spheres are indirectly coupled to a superconducting qubit through microwave cavity modes of two mutually perpendicular cavities.
  arXiv  Detail & Related papers  (2023-05-15T08:40:50Z)
• Magnon squeezing by two-tone driving of a qubit in cavity-magnon-qubit systems [7.123040671954896]
  We propose a scheme for preparing magnon squeezed states in a hybrid cavity-magnon-qubit system. The generated squeezed states are of a magnon mode involving more than $1018$ spins and thus macroscopic quantum states.
  arXiv  Detail & Related papers  (2023-04-21T06:09:13Z)
• Magnon blockade in magnon-qubit systems [0.0]
  A hybrid system by the direct interaction between a magnon mode and a superconducting transmon qubit is used to realize a high-degree blockade for magnon. It is a fundamental way toward quantum manipulation the level of a single magnon and preparation of single magnon sources.
  arXiv  Detail & Related papers  (2023-03-24T06:15:40Z)
• Over-Parameterization Exponentially Slows Down Gradient Descent for Learning a Single Neuron [49.45105570960104]
  We prove the global convergence of randomly gradient descent with a $Oleft(T-3right)$ rate. These two bounds jointly give an exact characterization of the convergence rate. We show this potential function converges slowly, which implies the slow convergence rate of the loss function.
  arXiv  Detail & Related papers  (2023-02-20T15:33:26Z)
• Dilute neutron star matter from neural-network quantum states [58.720142291102135]
  Low-density neutron matter is characterized by the formation of Cooper pairs and the onset of superfluidity. We model this density regime by capitalizing on the expressivity of the hidden-nucleon neural-network quantum states combined with variational Monte Carlo and reconfiguration techniques.
  arXiv  Detail & Related papers  (2022-12-08T17:55:25Z)
• Improved Graph Formalism for Quantum Circuit Simulation [77.34726150561087]
  We show how to efficiently simplify stabilizer states to canonical form. We characterize all linearly dependent triplets, revealing symmetries in the inner products. Using our novel controlled-Pauli $Z$ algorithm, we improve runtime for inner product computation from $O(n3)$ to $O(nd2)$ where $d$ is the maximum degree of the graph.
  arXiv  Detail & Related papers  (2021-09-20T05:56:25Z)
• Algorithmic Ground-state Cooling of Weakly-Coupled Oscillators using Quantum Logic [52.77024349608834]
  We introduce a novel algorithmic cooling protocol for transferring phonons from poorly- to efficiently-cooled modes. We demonstrate it experimentally by simultaneously bringing two motional modes of a Be$+$-Ar$13+$ mixed Coulomb crystal close to their zero-point energies. We reach the lowest temperature reported for a highly charged ion, with a residual temperature of only $Tlesssim200mathrmmu K$ in each of the two modes.
  arXiv  Detail & Related papers  (2021-02-24T17:46:15Z)
• Superposition of two-mode squeezed states for quantum information processing and quantum sensing [55.41644538483948]
  We investigate superpositions of two-mode squeezed states (TMSSs) TMSSs have potential applications to quantum information processing and quantum sensing.
  arXiv  Detail & Related papers  (2021-02-01T18:09:01Z)
• Anisotropy-mediated reentrant localization [62.997667081978825]
  We consider a 2d dipolar system, $d=2$, with the generalized dipole-dipole interaction $sim r-a$, and the power $a$ controlled experimentally in trapped-ion or Rydberg-atom systems. We show that the spatially homogeneous tilt $beta$ of the dipoles giving rise to the anisotropic dipole exchange leads to the non-trivial reentrant localization beyond the locator expansion.
  arXiv  Detail & Related papers  (2020-01-31T19:00:01Z)

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.