Generating Extreme Spin Squeezing

Carrasco, Sebastián; Goerz, Michael H.; Li, Zeyang; Colombo, Simone; Vuletić, Vladan; Malinovsky, Vladimir S.

doi:10.48550/arxiv.2201.01744

Cited by 3 publications

(3 citation statements)

References 38 publications

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“…At a fundamental level, it remains an outstanding question to determine whether Heisenberg scaling may be attainable in the non-Markovian regime in the presence of spatially correlated non-classical noise and, if so, by what kind of initial states. Setups involving a pre-measurement "countertwisting" operation [18,55] or alternating sequences of squeezing and rotation pulses [72] have been recently proposed in the closely related context of phase estimation, in which case the effect of noise occurs primarily during the OAT state preparation. Notably, Heisenberg scaling has been experimentally reported using such a "timereversal-based" metrology [19].…”

Section: Discussionmentioning

confidence: 99%

Frequency estimation under non-Markovian spatially correlated quantum noise: Restoring superclassical precision scaling

Riberi¹,

Norris²,

Beaudoin³

et al. 2022

Preprint

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We study the estimation precision attainable by entanglement-enhanced Ramsey interferometry in the presence of spatiotemporally correlated non-classical noise. Our analysis relies on an exact expression of the reduced density matrix of the qubit probes under general zero-mean Gaussian stationary dephasing, which is established through cumulant-expansion techniques and may be of independent interest in the context of non-Markovian open dynamics. By continuing and expanding our previous work [Beaudoin et al., Phys. Rev. A 98, 020102(R) ( 2018)], we analyze the effects of a non-collective coupling regime between the qubit probes and their environment, focusing on two limiting scenarios where the couplings may take only two or a continuum of possible values. In the paradigmatic case of spin-boson dephasing noise from a thermal environment, we find that it is possible to suppress, on average, the effect of spatial correlations by randomizing the location of the probes, as long as enough configurations are sampled where noise correlations are negative. As a result, superclassical precision scaling is asymptotically restored for initial entangled states, including experimentally accessible one-axis spin-squeezed states.

show abstract

Section: Discussionmentioning

confidence: 99%

Frequency estimation under non-Markovian spatially correlated quantum noise: Restoring superclassical precision scaling

Riberi¹,

Norris²,

Beaudoin³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…At a fundamental level, it remains an outstanding question to determine whether Heisenberg scaling may be attainable in the non-Markovian regime in the presence of spatially correlated non-classical noise and, if so, by what kind of initial states. Setups involving a pre-measurement 'countertwisting' operation [18,56] or alternating sequences of squeezing and rotation pulses [73] have been recently proposed in the closely related context of phase estimation, in which case the effect of noise occurs primarily during the OAT state preparation. Notably, Heisenberg scaling has been experimentally reported using such a 'time-reversal-based' metrology [19].…”

Section: Discussionmentioning

confidence: 99%

Frequency estimation under non-Markovian spatially correlated quantum noise

et al. 2022

View full text Add to dashboard Cite

We study the estimation precision attainable by entanglement-enhanced Ramsey interferometry in the presence of spatiotemporally correlated non-classical noise. Our analysis relies on an exact expression of the reduced density matrix of the qubit probes under general zero-mean Gaussian stationary dephasing, which is established through cumulant-expansion techniques and may be of independent interest in the context of non-Markovian open dynamics. By continuing and expanding our previous work [Beaudoin et al., Phys. Rev. A 98, 020102(R) (2018)], we analyze the effects of a non-collective coupling regime between the qubit probes and their environment, focusing on two limiting scenarios where the couplings may take only two or a continuum of possible values. In the paradigmatic case of spin-boson dephasing noise from a thermal environment, we find that it is in principle possible to suppress, on average, the effect of spatial correlations by randomizing the location of the probes, as long as enough configurations are sampled where noise correlations are negative. As a result, superclassical precision scaling is asymptotically restored for initial entangled states, including experimentally accessible one-axis spin-squeezed states.

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“…Time-dependent controls for spin squeezing in quantum metrology have been designed with reinforcement learning [547]. Large spin squeezing for Ramsey interferometry based on an alternating series of one-axis twisting pulses and rotations has also been designed with QOCT [115]. Coherent-state transfer in the groundstate manifold of an NV center spin using a laser can be accelerated with optimal control [556].…”

Section: State Preparation and Measurementmentioning

confidence: 99%

Quantum optimal control in quantum technologies. Strategic report on current status, visions and goals for research in Europe

Koch,

Boscain,

Calarco

et al. 2022

Preprint

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Quantum optimal control, a toolbox for devising and implementing the shapes of external fields that accomplish given tasks in the operation of a quantum device in the best way possible, has evolved into one of the cornerstones for enabling quantum technologies. The last few years have seen a rapid evolution and expansion of the field. We review here recent progress in our understanding of the controllability of open quantum systems and in the development and application of quantum control techniques to quantum technologies. We also address key challenges and sketch a roadmap for future developments.

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Generating Extreme Spin Squeezing

Cited by 3 publications

References 38 publications

Frequency estimation under non-Markovian spatially correlated quantum noise: Restoring superclassical precision scaling

Frequency estimation under non-Markovian spatially correlated quantum noise: Restoring superclassical precision scaling

Frequency estimation under non-Markovian spatially correlated quantum noise

Quantum optimal control in quantum technologies. Strategic report on current status, visions and goals for research in Europe

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