Generation of atom-light entanglement in an optical cavity for quantum enhanced atom interferometry

Haine, Simon A.; Lau, W. Y. Sarah

doi:10.1103/physreva.93.023607

Cited by 18 publications

(15 citation statements)

References 61 publications

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“…seperate statepreparation and interrogation stages), we simply optimised the controllable parameters of the system using the final sensitivity as the appropriate metric. The significant increase in performance that this approach pro-vides indicates the power of this technique, and could be used in other quantum-enhanced sensing protocols that involve the use of a controllable dynamic parameter, such as when coherent coupling pulses are used to increase the entangled population spontaneously generated from spinchanging collisions [41,47,48], four-wave mixing [49], or Raman superradiance [50,51]. Finally, we note that while this scheme is capable of enhancing the sensitivity of atomic clocks and magnetometers, the continuous use of coupling pulses is incompatible with atomic gravimeters and accelerometers due the the requirement of spacetime separated modes [1,52].…”

Section: Discussionmentioning

confidence: 99%

Machine-Designed Sensor to Make Optimal Use of Entanglement-Generating Dynamics for Quantum Sensing

Haine

Hope

2020

Phys. Rev. Lett.

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We use machine optimisation to develop a quantum sensing scheme that achieves significantly better sensitivity than traditional schemes with the same quantum resources. Utilising one-axis twisting dynamics to generate quantum entanglement, we find that rather than dividing the temporal resources into seperate state-preparation and interrogation stages, a complicated machine-designed sequence of rotations allows for the generation of metrologically useful entanglement while the parameter is interrogated. This provides much higher sensitivities for a given total time compared to states generated via traditional one-axis twisting schemes. This approach could be applied to other methods of generating quantum-enhanced states, allowing for atomic clocks, magnetometers, and inertial sensors with increased sensitivities.

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Section: Discussionmentioning

confidence: 99%

Machine-Designed Sensor to Make Optimal Use of Entanglement-Generating Dynamics for Quantum Sensing

Haine

Hope

2020

Phys. Rev. Lett.

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“…More generally, there are likely to be considerably more photons than atoms (n f < 1); since photons are "cheap" compared with atoms (in the sense that there are more severe particle-flux constraints on atoms than photons [48,49]), a large absolute sensitivity could be obtained by increasing the number of pump photons (i.e. increasing N ) while simultaneously decreasing n f (therefore decreasing the per particle sensitivity), in the spirit of information recycling protocols [26,27,[50][51][52][53].…”

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confidence: 99%

Pumped-Up SU(1,1) Interferometry

2017

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Although SU(1,1) interferometry achieves Heisenberg-limited sensitivities, it suffers from one major drawback: Only those particles outcoupled from the pump mode contribute to the phase measurement. Since the number of particles outcoupled to these "side modes" is typically small, this limits the interferometer's absolute sensitivity. We propose an alternative "pumped-up" approach where all the input particles participate in the phase measurement and show how this can be implemented in spinor BoseEinstein condensates and hybrid atom-light systems-both of which have experimentally realized SU(1,1) interferometry. We demonstrate that pumped-up schemes are capable of surpassing the shot-noise limit with respect to the total number of input particles and are never worse than conventional SU (1,1) interferometry. Finally, we show that pumped-up schemes continue to excel-both absolutely and in comparison to conventional SU(1,1) interferometry-in the presence of particle losses, poor particleresolution detection, and noise on the relative phase difference between the two side modes. Pumped-up SU(1,1) interferometry therefore pushes the advantages of conventional SU(1,1) interferometry into the regime of high absolute sensitivity, which is a necessary condition for useful quantum-enhanced devices.

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“…It has been shown that in the presence of entanglement between the state and some auxiliary system, the metrological usefulness of the state may be enhanced by allowing measurements on the auxiliary system [42][43][44][45][46][47][48]. However in this paper we take a different approach, and study the metrological usefulness of a state if measurements of the auxiliary system are forbidden.…”

Section: Introductionmentioning

confidence: 98%

Quantum Fisher information as a predictor of decoherence in the preparation of spin-cat states for quantum metrology

Nolan

Haine

2017

Phys. Rev. A

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In its simplest form, decoherence occurs when a quantum state is entangled with a second state, but the results of measurements made on the second state are not accessible. As the second state has effectively "measured" the first, in this paper we argue that the quantum Fisher information is the relevant metric for predicting and quantifying this kind of decoherence. The quantum Fisher information is usually used to determine an upper bound on how precisely measurements on a state can be used to estimate a classical parameter, and as such it is an important resource. Quantum-enhanced metrology aims to create nonclassical states with large quantum Fisher information and utilize them in precision measurements. In the process of doing this it is possible for states to undergo decoherence; for instance atom-light interactions used to create coherent superpositions of atomic states may result in atom-light entanglement. Highly nonclassical states, such as spin-cat states (Schrödinger cat states constructed from superpositions of collective spins) are shown to be highly susceptible to this kind of decoherence. We also investigate the required field occupation of the second state, such that this decoherence is negligible.

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Generation of atom-light entanglement in an optical cavity for quantum enhanced atom interferometry

Cited by 18 publications

References 61 publications

Machine-Designed Sensor to Make Optimal Use of Entanglement-Generating Dynamics for Quantum Sensing

Machine-Designed Sensor to Make Optimal Use of Entanglement-Generating Dynamics for Quantum Sensing

Pumped-Up SU(1,1) Interferometry

Quantum Fisher information as a predictor of decoherence in the preparation of spin-cat states for quantum metrology

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