Cooperative squeezing of internal and collective spins in an atomic ensemble

• URL: http://arxiv.org/abs/2503.05446v3
• Date: Mon, 14 Apr 2025 05:55:36 GMT
• Title: Cooperative squeezing of internal and collective spins in an atomic ensemble
• Authors: Youwei Zhang, Shenchao Jin, Junlei Duan, Klaus Mølmer, Guiying Zhang, Mingfeng Wang, Yanhong Xiao,
• Abstract summary: We experimentally demonstrate combined internal and collective spin squeezing in a hot atomic ensemble with rubidium atoms.<n>Our approach provides a new perspective on fully harnessing the degrees of freedom inherent in quantum states of an atomic ensemble.
• Score: 1.2197883665266454
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Creating highly spin-squeezed states for quantum metrology surpassing the standard quantum limit is a topic of great interest. Spin squeezing has been achieved by either entangling different atoms in an ensemble, or by controlling the multi-level internal spin state of an atom. Here, we experimentally demonstrate combined internal and collective spin squeezing in a hot atomic ensemble with $\sim 10^{11}$ rubidium atoms. By synergistically combining these two types of squeezing and carefully aligning their squeezing quadratures, we have achieved a metrologically relevant spin squeezing of $-6.21\pm0.84$ dB, significantly outperforming the results obtained by utilizing either type of squeezing alone. Our approach provides a new perspective on fully harnessing the degrees of freedom inherent in quantum states of an atomic ensemble.

Related papers

• Spin squeezing in an ensemble of nitrogen-vacancy centers in diamond [6.338826024477338]
  We present the first experimental demonstration of spin squeezing in a solid-state spin system. Our results open the door to entanglement-enhanced metrology using macroscopic ensembles of optically active spins in solids.
  arXiv  Detail & Related papers  (2025-03-18T18:00:01Z)
• Harnessing Chiral Spin States in Molecular Nanomagnets for Quantum Technologies [44.1973928137492]
  We show that chiral qubits naturally suppress always-on interactions that can not be switched off in weakly coupled qubits. Our findings establish spin chirality engineering as a promising strategy for mitigating always-on interaction in entangling two chiral qubits in molecular quantum technologies.
  arXiv  Detail & Related papers  (2025-01-21T08:23:12Z)
• Spin Squeezing with Magnetic Dipoles [37.93140485169168]
  Entanglement can improve the measurement precision of quantum sensors beyond the shot noise limit.<n>We take advantage of the magnetic dipole-dipole interaction native to most neutral atoms to realize spin-squeezed states.<n>We achieve 7.1 dB of metrologically useful squeezing using the finite-range spin exchange interactions in an erbium quantum gas microscope.
  arXiv  Detail & Related papers  (2024-11-11T18:42:13Z)
• Strongly subradiant states in planar atomic arrays [39.58317527488534]
  We study collective dipolar oscillations in finite planar arrays of quantum emitters in free space. We show that the external coupling between the collective states associated with the symmetry of the array and with the quasi-flat dispersion of the corresponding infinite lattice plays a crucial role in the boost of their radiative lifetime.
  arXiv  Detail & Related papers  (2023-10-10T17:06:19Z)
• Concurrent spin squeezing and light squeezing in an atomic ensemble [1.5467049683274625]
  We propose a novel protocol based on judiciously engineered symmetric atom-light interaction. We report results of concurrent spin squeezing of $0.61pm0.09mathrmdB$ and light squeezing of $0.65+0.11_-0.10mathrmdB$ in a hot atomic ensemble. Our method can be extended to other quantum platforms such as optomechanics, cold atom and trapped ions.
  arXiv  Detail & Related papers  (2023-10-03T23:47:30Z)
• A high-flux source system for matter-wave interferometry exploiting tunable interactions [33.92525320044496]
  Atom interferometers allow determining inertial effects to high accuracy. Here we report on a high-flux source of ultra-cold atoms with free expansion rates near the Heisenberg limit directly upon release from the trap.
  arXiv  Detail & Related papers  (2023-07-13T14:10:53Z)
• Spin Squeezing by Rydberg Dressing in an Array of Atomic Ensembles [0.0]
  We report on the creation of an array of spin-squeezed ensembles of cesium atoms via Rydberg dressing. We optimize the coherence of the interactions by a stroboscopic dressing sequence that suppresses super-Poissonian loss.
  arXiv  Detail & Related papers  (2023-03-15T17:55:28Z)
• Quantum Gates Between Mesoscopic Spin Ensembles [0.0]
  We show that in the limit where the size of the ensembles is small, it is possible to treat them as qubits with an effective coupling strength that scales with the number of spins. One- and two-qubit gate operations can be implemented with high fidelities.
  arXiv  Detail & Related papers  (2023-03-04T02:49:26Z)
• 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)
• Probing quantum entanglement from magnetic-sublevels populations: beyond spin squeezing inequalities [0.0]
  Spin squeezing inequalities (SSI) represent a major tool to probe quantum entanglement among a collection of few-level atoms. Many experiments can image the populations in all Zeeman sublevels $s=-j, -j+1, dots, j$, potentially revealing finer features of quantum entanglement not captured by SSI. Here we present a systematic approach which exploits Zeeman-sublevel population measurements in order to construct novel entanglement criteria.
  arXiv  Detail & Related papers  (2022-03-25T10:09:46Z)
• Quantum control of nuclear spin qubits in a rapidly rotating diamond [62.997667081978825]
  Nuclear spins in certain solids couple weakly to their environment, making them attractive candidates for quantum information processing and inertial sensing. We demonstrate optical nuclear spin polarization and rapid quantum control of nuclear spins in a diamond physically rotating at $1,$kHz, faster than the nuclear spin coherence time. Our work liberates a previously inaccessible degree of freedom of the NV nuclear spin, unlocking new approaches to quantum control and rotation sensing.
  arXiv  Detail & Related papers  (2021-07-27T03:39:36Z)
• Partitioning dysprosium's electronic spin to reveal entanglement in non-classical states [55.41644538483948]
  We report on an experimental study of entanglement in dysprosium's electronic spin. Our findings open up the possibility to engineer novel types of entangled atomic ensembles.
  arXiv  Detail & Related papers  (2021-04-29T15:02:22Z)
• Hyperfine and quadrupole interactions for Dy isotopes in DyPc$_2$ molecules [77.57930329012771]
  Nuclear spin levels play an important role in understanding magnetization dynamics and implementation and control of quantum bits in lanthanide-based single-molecule magnets. We investigate the hyperfine and nuclear quadrupole interactions for $161$Dy and $163$Dy nucleus in anionic DyPc$.
  arXiv  Detail & Related papers  (2020-02-12T18:25:31Z)

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.