Entanglement-Enhanced Optical Atomic Clock
arXiv:2006.07501 · doi:10.1038/s41586-020-3006-1
Abstract
State-of-the-art atomic clocks are based on the precise detection of the energy difference between two atomic levels, measured as a quantum phase accumulated in a given time interval. Optical-lattice clocks (OLCs) now operate at or near the standard quantum limit (SQL) that arises from the quantum noise associated with discrete measurement outcomes. While performance beyond the SQL has been achieved in microwave clocks and other atomic sensors by engineering quantum correlations (entanglement) between the atoms, the generation of entanglement on an optical-clock transition and operation of such a clock beyond the SQL represent major goals in quantum metrology that have never been demonstrated. Here we report creation of a many-atom entangled state on an optical transition, and demonstrate an OLC with an Allan deviation below the SQL. We report a metrological gain of dB over the SQL using an ensemble consisting of a few hundred 171Yb atoms, allowing us to reach a given stability times faster than the same clock operated at the SQL. Our results should be readily applicable to other systems, thus enabling further advances in timekeeping precision and accuracy. Entanglement-enhanced OLCs will have many scientific and technological applications, including precision tests of the fundamental laws of physics, geodesy, or gravitational wave detection.
4 figures, 7 pages
References in corpus (32)
- Quantum metrology with nonclassical states of atomic ensembles
- Search for New Physics with Atoms and Molecules
- Experimental issues in coherent quantum-state manipulation of trapped atomic ions
- Nonlinear atom interferometer surpasses classical precision limit
- Atom chip based generation of entanglement for quantum metrology
- 1.5 m lasers with sub 10 mHz linewidth
- Quantum spin dynamics and entanglement generation with hundreds of trapped ions
- Implementation of Cavity Squeezing of a Collective Atomic Spin
- Geodesy and metrology with a transportable optical clock
- Optical clock intercomparison with precision in one hour
- A clock network for geodesy and fundamental science
- Mesoscopic atomic entanglement for precision measurements beyond the standard quantum limit
- Gravitational wave detection with optical lattice atomic clocks
- Ultra-stable optical clock with two cold-atom ensembles
- Spin-Nematic Squeezed Vacuum in a Quantum Gas
- Deterministic Squeezed States with Joint Measurements and Feedback
- Comparison of Two Independent Sr Optical Clocks with 1e-17 Stability at 10^3 s
- Seconds-scale coherence in a tweezer-array optical clock
- Orientation-Dependent Entanglement Lifetime in a Squeezed Atomic Clock
- Squeezing the Collective Spin of a Dilute Atomic Ensemble by Cavity Feedback
- Rabi Spectroscopy and Excitation Inhomogeneity in a 1D Optical Lattice Clock
- First observation with global network of optical atomic clocks aimed for a dark matter detection
- How do you know if you ran through a wall?
- Spin squeezing of a cold atomic ensemble with the nuclear spin of one-half
- Atom interferometry with the Sr optical clock transition
- 0.75 atoms improve the clock signal of 10,000 atoms
- Near-Unitary Spin Squeezing in Yb
- Noise and instability of an optical lattice clock
- A noise-immune cavity-assisted non-destructive detection for an optical lattice clock in the quantum regime
- Impact of Non-Unitary Spin Squeezing on Atomic Clock Performance
- Geometrically asymmetric optical cavity for strong atom-photon coupling
- Robust kHz-linewidth distributed Bragg reflector laser with optoelectronic feedback
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- Realizing spin squeezing with Rydberg interactions in a programmable optical clock
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- A quantum network of entangled optical atomic clocks
- Distributed quantum sensing with a mode-entangled network of spin-squeezed atomic states
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- Entanglement-enhanced quantum metrology: from standard quantum limit to Heisenberg limit
- Theoretical Guarantees for Permutation-Equivariant Quantum Neural Networks
- Quantum-enhanced sensing on an optical transition via emergent collective quantum correlations
- Universal quantum operations and ancilla-based readout for tweezer clocks
- Spin Squeezing by Rydberg Dressing in an Array of Atomic Ensembles
- Improving cold-atom sensors with quantum entanglement: Prospects and challenges
- Combining critical and quantum metrology
- Beating the Standard Quantum Limit under Ambient Conditions with Solid-State Spins
- Collective Spin-Light and Light-Mediated Spin-Spin Interactions in an Optical Cavity
- Prospects and challenges for squeezing-enhanced optical atomic clocks
- Nonlinear interferometry beyond classical limit facilitated by cyclic dynamics
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- Generating stable spin squeezing by squeezed-reservoir engineering
- Multi-ensemble metrology by programming local rotations with atom movements
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- Beyond one-axis twisting: Simultaneous spin-momentum squeezing
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- Clock precision beyond the Standard Quantum Limit at level
- GHZ protocols enhance frequency metrology despite spontaneous decay
- Atomic clock locking with Bayesian quantum parameter estimation: scheme and experiment
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- Analysis of spin-squeezing generation in cavity-coupled atomic ensembles with continuous measurements
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- Improved absolute clock stability by the joint interrogation of two atomic states
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- Two-parameter estimation with three-mode NOON state in a symmetric three-well system
- Fully Collective Superradiant Lasing with Vanishing Sensitivity to Cavity Length Vibrations
- Enhancing optomechanical force sensing utilizing synthetic magnetism
- Selective collective emission from a dense atomic ensemble coupled to a nanophotonic resonator
- Entanglement generation via single-qubit rotations in a torn Hilbert space
- Entanglement-enhanced Synchronous differential comparison
- Symmetry: a fundamental resource for quantum coherence and metrology
- Quantum Metrology via Floquet-Engineered Two-axis Twisting and Turn Dynamics
- Saturating the one-axis twisting quantum Cramér-Rao bound with a total spin readout
- Quantum Sensing Using Atomic Clocks for Nuclear and Particle Physics
- Quantum Technology for Military Applications
- Simultaneous Quantum Squeezing of Light Polarizations and Atomic Spins in a Cold Atomic Gas
- Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map
- Joint Estimation of a Two-Phase Spin Rotation beyond Classical Limit
- Quantum Signatures of Topological Phase in Bosonic Quadratic System
- Bayesian and frequentist estimators for the transition frequency of a driven two-level quantum system
- SU(2) hyper-clocks: quantum engineering of spinor interferences for time and frequency metrology
- Contextual quantum metrology
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- Heisenberg-Limited Quantum Metrology without Ancillae
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