{"total":21,"items":[{"citing_arxiv_id":"2607.02320","ref_index":9,"ref_count":1,"confidence":0.88,"is_internal_anchor":true,"paper_title":"Time-Reversal and Reversible Dynamics in Cavity QED for Quantum Metrology","primary_cat":"quant-ph","submitted_at":"2026-07-02T15:29:43+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":1.0,"formal_verification":"none","one_line_summary":"A review of time-reversal and interaction-based readout in cavity QED for quantum metrology, covering SATIN, scrambling-enhanced metrology, and related schemes.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2606.31910","ref_index":32,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Electrons on Helium and Entangled Quantum Sensors for Particle Physics","primary_cat":"quant-ph","submitted_at":"2026-06-30T16:13:30+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":4.0,"formal_verification":"none","one_line_summary":"Proposes entangled electron qubits on helium in a double-well trap as a quantum sensor concept for enhanced sensitivity in particle physics.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2606.21068","ref_index":31,"ref_count":1,"confidence":0.88,"is_internal_anchor":true,"paper_title":"Finite-Time Electrometry with a Quantum-Regime Single-Ion Phonon Laser","primary_cat":"quant-ph","submitted_at":"2026-06-19T03:35:12+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"First experimental realization of a quantum-regime single-ion phonon laser for electrometry, achieving 14.15 μV/m/√Hz sensitivity governed by finite-time Liouvillian dynamics.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2606.20328","ref_index":60,"ref_count":1,"confidence":0.88,"is_internal_anchor":true,"paper_title":"Effective Faraday interaction between light and Helium-3 nuclear spins in a multi-pass cell","primary_cat":"quant-ph","submitted_at":"2026-06-18T15:04:28+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Experimental demonstration of light-nuclear spin interface in He-3 via metastability-exchange collisions in multi-pass cell, with projected measurement-induced squeezing rate of 0.52 s^{-1}.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2606.19947","ref_index":40,"ref_count":1,"confidence":0.88,"is_internal_anchor":true,"paper_title":"QMaxCal: Path-Space Regularization for Open Quantum Control via Girsanov's Theorem","primary_cat":"quant-ph","submitted_at":"2026-06-18T08:44:18+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Derives KL_W and R_DV regularizers from Girsanov's theorem that reduce infidelity by up to 50% and improve robustness to noise mismatch on single- and multi-qubit benchmarks including an IBM Kingston calibration.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2606.18552","ref_index":129,"ref_count":1,"confidence":0.88,"is_internal_anchor":true,"paper_title":"Towards Entanglement-Enhanced Atom Interferometry Using Bow-Tie Cavities","primary_cat":"quant-ph","submitted_at":"2026-06-17T00:01:45+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"A monolithic bow-tie cavity with finesse 5.7e4 is realized for homogeneous coupling to Sr atoms at 689 nm, projected to enable up to 28 dB spin squeezing for quantum-enhanced interferometry.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2606.18169","ref_index":10,"ref_count":1,"confidence":0.88,"is_internal_anchor":true,"paper_title":"Optimal Probe State for Phase Estimation Under Covariant Measurement","primary_cat":"quant-ph","submitted_at":"2026-06-16T17:06:57+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"Optimal probe states for phase estimation under covariant measurements are given by the principal eigenvector of a Toeplitz matrix constructed from the cost function, achieving Heisenberg scaling for a specific cost.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2605.24120","ref_index":5,"ref_count":1,"confidence":0.88,"is_internal_anchor":true,"paper_title":"Quantum Sensing and Quantum Error Correction: Two Sides of the Same Coin","primary_cat":"quant-ph","submitted_at":"2026-05-22T18:25:54+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Quantum error-correcting codes are connected to sensor states in quantum metrology, illustrated by relating the absorption-emission code to states for arbitrary rotation sensing.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2605.08337","ref_index":2,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Entanglement Requirements for Coherent Enhancement in Detectors","primary_cat":"hep-ph","submitted_at":"2026-05-08T18:00:00+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Coherent enhancement in detectors is quantitatively constrained by single-mode entanglement entropy, with general bounds on scaling with system size that interpolate between incoherent and fully coherent regimes.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"framework for understanding the limits of coherent en- hancement across quantum sensing, metrology, and scat- tering experiments, and clarify the entanglement re- sources required to surpass incoherent scaling. They ∗ zbogorad@fnal.gov † roni@fnal.gov refine the relationship between multipartite entangle- ment and enhanced quantum Fisher information, extend- ing the Cram' er-Rao bound [2, 22-24] and the famil- iar distinction between the standard quantum limit and Heisenberg-limited scaling to a broader class of states. The analogous scattering bounds constrain coherent con- tributions to inelastic transition probabilities and thereby limit how detectable interaction strengths can scale with target size. This perspective is particularly relevant for"},{"citing_arxiv_id":"2605.03958","ref_index":24,"ref_count":1,"confidence":0.88,"is_internal_anchor":false,"paper_title":"Fisher-Informational Time: A Causal-Geometric Framework for Emergent Clock Time Physical Distinguishability","primary_cat":"quant-ph","submitted_at":"2026-05-05T16:42:30+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Clock time is reconstructed from the accumulated Fisher distinguishability along causally ordered physical changes, rather than being a fundamental quantity measured by clocks.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2605.03746","ref_index":8,"ref_count":1,"confidence":0.88,"is_internal_anchor":false,"paper_title":"Tomogram-based quantifiers of nonclassicality dynamics in Kerr and cubic media","primary_cat":"quant-ph","submitted_at":"2026-05-04T14:48:02+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Tomogram-based homodyne nonclassical area and sum tomographic entropy provide experimentally accessible quantifiers that track the onset, fractional revivals, and decay of nonclassicality in damped nonlinear optical media.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"Conversely, for the generation o f genuinely quantum states from pure classical inputs, nonlinear interactions like the Ke rr effect, Parametric down conversion and higher-order wave mixing are required. They im part anharmonic- ities required to induce distinctly nonclassical characteristics such as entanglement, squeezing and sub-Poissonian statistics [ 8]. Nonlinear effects, including the Kerr effect, triggers an intensity-dependent phase shift to the optical pulse p assing through it, making an isotropic medium anisotropic, and leading to nonclassical ph enomena such as revivals and fractional revivals [ 9, 10]. While revivals imply the periodic reforma- tion of the state to its initial form, fractional revivals correspond to the splitting of the"},{"citing_arxiv_id":"2605.02151","ref_index":19,"ref_count":3,"confidence":0.88,"is_internal_anchor":true,"paper_title":"Optimizing Quantum Entanglement Preservation in a Qubit Qubit System with Dzyaloshinskii Moriya Interaction under Noisy Magnetic Fields via Feedback Control","primary_cat":"quant-ph","submitted_at":"2026-05-04T02:27:09+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":4.0,"formal_verification":"none","one_line_summary":"Proportional-integral feedback on DM coupling strength doubles time-averaged negativity under colored noise and yields 2.5 times better sensitivity than the shot-noise limit in quantum metrology simulations.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"Ji, \"Influence of Dzyaloshinskii Moriya interaction on entanglement in a two qubit Heisenberg XYZ system,\" Solid State Commun. 151, 790 (2011). DOI: https://doi.org/10.1016/j.ssc.2011.02.032 [18] J. Liu, H. Yuan, X. M. Lu, and X. Wang, \"Quantum Fisher information matrix and multiparameter estimation,\" J. Phys. A: Math. Theor. 53, 023001 (2020). DOI: https://doi.org/10.1088/1751-8121/ab5d6d [19] L. Pezzè, A. Smerzi, M. K. Oberthaler, R. Schmied, and P. Treutlein, \"Quantum metrology with non classical states of atomic ensembles,\" Rev. Mod. Phys. 90, 035005 (2018). DOI: https://doi.org/10.1103/RevModPhys.90.035005 [20] D. Girolami, T. Tufarelli, and G. Adesso, \"Characterizing nonclassical correlations via local quantum uncertainty,\" Phys."},{"citing_arxiv_id":"2604.23476","ref_index":1,"ref_count":1,"confidence":0.88,"is_internal_anchor":false,"paper_title":"From Independent to Joint: Enhancing Quantum Phase and Correlation Factor Estimation by Squeezed Reservoir Engineering","primary_cat":"quant-ph","submitted_at":"2026-04-26T00:01:36+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Optimizing the squeezing phase in a correlated squeezed-thermal reservoir maximizes quantum Fisher information for phase and correlation parameters and reduces joint-estimation variance.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2604.10948","ref_index":45,"ref_count":1,"confidence":0.88,"is_internal_anchor":false,"paper_title":"Enhanced squeezing for quantum gravimetry in a Bose-Einstein condensate with focussing","primary_cat":"cond-mat.quant-gas","submitted_at":"2026-04-13T03:42:34+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"A delta-kick focusing step applied to a BEC before one-axis twisting enhances spin squeezing and yields a fourfold improvement in phase sensitivity for quantum gravimetry, surpassing the SQL by a factor of ~20.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"Standard atom interferometers use uncorrelated atoms, and hence their precision is bounded by the shot noise limit. Quantum entanglement offers a promising pathway to improved mea- surement sensitivity , as it allows the shot noise limit to be surpassed[44-49]. Bose-Einstein condensates (BECs) are an excellent candidate for entanglement-enhanced interferometry , due to their high level of control and tunability[45]. Indeed, numerous experiments have demonstrated the generation of entanglement and spin squeezing in BECs and ensembles of cold atoms, often yielding clear interferometric enhancement, but without implementing a complete metrological measurement that exploits this enhancement in a practical sensing task[50-54]. In practice, extending such techniques to free-fall atom interferometers remains"},{"citing_arxiv_id":"2604.09772","ref_index":5,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Leggett-Garg Inequality Violations Bound Quantum Fisher Information","primary_cat":"quant-ph","submitted_at":"2026-04-10T18:00:34+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Leggett-Garg inequality violations yield lower bounds on quantum Fisher information in stationary pure and thermal states, serving as a witness for many-body quantum coherence.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"Rept.474, 1 (2009), arXiv:0811.2803 [quant-ph]. [3] L. Pezzè, A. Smerzi, M. K. Oberthaler, R. Schmied, and P. Treutlein, Quantum metrology with nonclassical states of atomic ensembles, Rev. Mod. Phys.90, 035005 (2018), 5 arXiv:1609.01609 [quant-ph]. [4] V. Giovannetti, S. Lloyd, and L. Maccone, Quantum metrology, Phys. Rev. Lett.96, 010401 (2006). [5] L. Amico, R. Fazio, A. Osterloh, and V. Vedral, Entan- glement in many-body systems, Rev. Mod. Phys.80, 517 (2008), arXiv:quant-ph/0703044. [6] A. J. Leggett and A. Garg, Quantum mechanics versus macroscopicrealism: Isthefluxtherewhennobodylooks?, Phys. Rev. Lett.54, 857 (1985). [7] J. P. Paz and G. Mahler, Proposed test for temporal bell inequalities, Phys."},{"citing_arxiv_id":"2512.19053","ref_index":31,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Quantum sensing of high-frequency gravitational waves with ion crystals","primary_cat":"gr-qc","submitted_at":"2025-12-22T05:42:49+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Ion crystals detect high-frequency gravitational waves via resonant drumhead mode excitation and spin entanglement for beyond-SQL readout, with sensitivity scaling with crystal size.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2509.05717","ref_index":15,"ref_count":1,"confidence":0.88,"is_internal_anchor":false,"paper_title":"Deterministic nuclear spin squeezing and squeezing by continuous measurement using vector and tensor light shifts","primary_cat":"quant-ph","submitted_at":"2025-09-06T13:50:27+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"The authors identify distinct regimes for QND measurement squeezing (short times) and deterministic squeezing (longer times) via the ratio of tensor to vector light shifts, predicting a spin variance of 0.03 in 50 ms for Yb-173.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2504.07814","ref_index":37,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Estimating the best separable approximation of non-pure spin-squeezed states","primary_cat":"quant-ph","submitted_at":"2025-04-10T14:51:18+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Lower bounds on the best separable approximation distance for non-pure spin-squeezed states are obtained from the complete set of spin-squeezing inequalities, with symmetry-exploiting optimization for upper bounds, revealing finite-temperature entanglement in ordered phases of the XXZ model.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2410.22032","ref_index":13,"ref_count":1,"confidence":0.88,"is_internal_anchor":true,"paper_title":"From spin squeezing to fast state discrimination","primary_cat":"quant-ph","submitted_at":"2024-10-29T13:30:29+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"In the large-N limit, spin squeezing torsion yields a nonlinear qubit governed by the two-state Gross-Pitaevskii equation that solves single-input state discrimination on the Bloch sphere.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"1907.10174","ref_index":4,"ref_count":1,"confidence":0.88,"is_internal_anchor":true,"paper_title":"Squeezed state metrology with Bragg interferometers operating in a cavity","primary_cat":"physics.atom-ph","submitted_at":"2019-07-23T23:19:57+00:00","verdict":"CONDITIONAL","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Theoretical proposal for cavity-based momentum-state spin squeezing in Bragg interferometers that models momentum width and off-manifold coupling and predicts feasible squeezing levels with current technology.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"1906.10929","ref_index":213,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Entanglement Certification $-$ From Theory to Experiment","primary_cat":"quant-ph","submitted_at":"2019-06-26T09:24:44+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":0.0,"formal_verification":"none","one_line_summary":"Reviews paradigmatic entanglement quantifiers and state-of-the-art detection/certification methods, with emphasis on assumptions about states and measurements.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"it is N-producible, but not ( N− 1)-producible). The concept of entanglement depth is particularly useful for systems with very many particles, approaching the ther- modynamic limit, since the resulting hierarchy is (some- what) independent from the total number of particles N. Entanglement depth is therefore often used in exper- iments with atomic ensembles [213]. Tensor rank & Schmidt rank vectors. In contrast to the bipartite case, there is no such thing as a Schmidt decomposition (at least not in the same sense) for multi- partite systems. That is, not every multipartite state can be written as|ΨN⟩ =∑ i λi|i⟩⊗N. Nonetheless, there are two prominent ways to generalise the Schmidt rank for multipartite pure states."}],"limit":50,"offset":0}