Fast generation of spin squeezing via resonant spin-boson coupling

Barberena, Diego; Muleady, Sean R.; Bollinger, John J.; Lewis-Swan, Robert J.; Rey, Ana María

doi:10.48550/arxiv.2201.10622

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…Our experiments demonstrate a cQED realization of the critically tuned (W ¼ Sc) LMG model with an exponential evolution in phase space. We also point out and experimentally verify that time-reversal protocols represent a powerful experimental tool giving access not only to metrological gain beyond the SQL (22,23,48), but also enabling the measurement of quantum information scrambling in many-body systems. This generalizes the possibilities of using quantum information science to enhance quantum metrology (49).…”

Section: Discussionmentioning

confidence: 65%

Improving metrology with quantum scrambling

Colombo

Shu

et al. 2023

Science

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Quantum scrambling describes the spreading of information into many degrees of freedom in quantum systems, such that the information is no longer accessible locally but becomes distributed throughout the system. This idea can explain how quantum systems become classical and acquire a finite temperature, or how in black holes the information about the matter falling in is seemingly erased. We probe the exponential scrambling of a multiparticle system near a bistable point in phase space and utilize it for entanglement-enhanced metrology. A time-reversal protocol is used to observe a simultaneous exponential growth of both the metrological gain and the out-of-time-order correlator, thereby experimentally verifying the relation between quantum metrology and quantum information scrambling. Our results show that rapid scrambling dynamics capable of exponentially fast entanglement generation are useful for practical metrology, resulting in a 6.8(4)-decibel gain beyond the standard quantum limit.

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Section: Discussionmentioning

confidence: 65%

Improving metrology with quantum scrambling

Colombo

Shu

et al. 2023

Science

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“…To do this, we utilize the dissipative discrete truncated Wigner approximation (DDTWA) [42,60,61] to efficiently solve for the quantum dynamics when N > 10 for these two models (otherwise, we resort to exact methods). DDTWA has previously been benchmarked for calculations of quantum spin dynamics and spin squeezing generation for various models [30,62], and affords an efficient semiclassical description of the dynamics.…”

Section: F Numerical Methodsmentioning

confidence: 99%

Quantum-enhanced sensing on an optical transition via emergent collective quantum correlations

Franke¹,

Muleady²,

Kaubruegger³

et al. 2023

Preprint

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The control over quantum states in atomic systems has led to the most precise optical atomic clocks to date [1][2][3]. Their sensitivity is currently bounded by the standard quantum limit, a fundamental floor set by quantum mechanics for uncorrelated particles, which can nevertheless be overcome when operated with entangled particles. Yet demonstrating a quantum advantage in real world sensors is extremely challenging and remains to be achieved aside from two remarkable examples, LIGO [4,5] and more recently HAYSTAC [6]. Here we illustrate a pathway for harnessing scalable entanglement in an optical transition using 1D chains of up to 51 ions with state-dependent interactions that decay as a power-law function of the ion separation. We show our sensor can be made to behave as a oneaxis-twisting (OAT) model, an iconic fully connected model known to generate scalable squeezing [7] and GHZ-like states [8][9][10][11]. The collective nature of the state manifests itself in the preservation of the total transverse magnetization, the reduced growth of finite momentum spin-wave excitations, the generation of spin squeezing comparable to OAT (a Wineland parameter [12,13] of −3.9±0.3 dB for only N = 12 ions) and the development of non-Gaussian states in the form of atomic multi-headed cat states in the Q-distribution. The simplicity of our protocol enables scalability to large arrays with minimal overhead, opening the door to advances in timekeeping as well as new methods for preserving coherence in quantum simulation and computation. We demonstrate this in a Ramseytype interferometer, where we reduce the measurement uncertainty by −3.2 ± 0.5 dB below the standard quantum limit for N = 51 ions.

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Fast generation of spin squeezing via resonant spin-boson coupling

Cited by 2 publications

References 29 publications

Improving metrology with quantum scrambling

Improving metrology with quantum scrambling

Quantum-enhanced sensing on an optical transition via emergent collective quantum correlations

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