Proposal for the distribution of multiphoton entanglement with optimal rate-distance scaling

Mycroft, Monika E.; McDermott, Thomas E.; Buraczewski, Adam; Stobińska, Magdalena

doi:10.1103/physreva.107.012607

Cited by 3 publications

(4 citation statements)

References 80 publications

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“…These states also yielded reasonable precision for joint estimation. We will show that probes prepared in gHB states, which are experimentally viable and live in higher-dimensional Hilbert spaces [46], can provide significantly better precision.…”

Section: The Settingmentioning

confidence: 96%

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Quantum-enhanced joint estimation of phase and phase diffusion

Jayakumar,

Mycroft,

Barbieri

et al. 2024

New J. Phys.

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Accurate phase estimation in the presence of unknown phase diffusive noise is a crucial yet challenging task in noisy quantum metrology. This problem is particularly interesting due to the detrimental impact of the associated noise. Here, we investigate the joint estimation of phase and phase diffusion using generalized Holland–Burnett states, known for their experimental accessibility. These states provide performance close to the optimal state in single-parameter phase estimation, even in the presence of photon losses. We adopt a twofold approach by analyzing the joint information extraction through the double homodyne measurement and the joint information availability across all probe states. Through our analysis, we find that the highest sensitivities are obtained by using states created by directing all input photons into one port of a balanced beam splitter. Furthermore, we infer that good levels of sensitivity persist even in the presence of moderate photon losses, illustrating the remarkable resilience of our probe states under lossy conditions.

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Section: The Settingmentioning

confidence: 96%

“…2) are the Kravchuk coefficients [46]. As a special case, when we input equal numbers of photons into a balanced beam splitter, i.e.…”

Section: The Settingmentioning

confidence: 99%

Quantum-enhanced joint estimation of phase and phase diffusion

Jayakumar,

Mycroft,

Barbieri

et al. 2024

New J. Phys.

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show abstract

“…In this way, in the Bell test, we no longer need to perform rotations directly in the Fock state basis, but we carry out rotations of a spin that fluctuates in length instead. These Bell tests can detect nonlocality in a wide class of bipartite entanglement: squeezed vacuum, single-photon entanglement, entangled coherent states, and generalized Holland-Burnett states [25,[45][46][47][48][49][50].…”

Section: General Bell Test Design For Optical Hybrid Entanglementmentioning

confidence: 99%

CHSH Bell tests for optical hybrid entanglement

Moradi,

Camilo López Carreño,

Buraczewski

et al. 2024

New J. Phys.

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Optical hybrid entanglement can be created between two qubits, one encoded in a single photon and another one in coherent states with opposite phases. It opens the path to a variety of quantum technologies, such as heterogeneous quantum networks, merging continuous- and discrete-variable encoding, and enabling the transport and interconversion of information. However, reliable characterization of the non-local nature of this quantum state is limited so far to full quantum state tomography. Here, we perform a thorough study of Clauser-Horne-Shimony-Holt (CHSH) Bell inequality tests, enabling practical verification of quantum nonlocality for optical hybrid entanglement. We show that a practical violation of this inequality is possible with simple photon number on/off measurements if detection efficiencies stay above 82%. Another approach, based on photon-number parity measurements, requires 94% efficiency but works well in the limit of higher photon populations. Both tests use no postselection of the measurement outcomes and they are free of the fair-sampling hypothesis. Our proposal paves the way to performing loophole-free tests using feasible experimental tasks such as coherent state interference and photon counting.

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“…In the initial step of the protocol under consideration, two users, Alice and Bob, try to share entanglement with the help of a third node. 1 Each user owns a spontaneous parametric down-conversion (SPDC) which creates entangled photons in the form of two mode squeezed vacuum (TMSV) states:…”

Section: Reviewing the Protocolmentioning

confidence: 99%

Enhancing free space DI QKD via employing NPA hierarchy method

Stobinska,

Afsary,

Moradi

2024

Quantum Technologies 2024

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Proposal for the distribution of multiphoton entanglement with optimal rate-distance scaling

Cited by 3 publications

References 80 publications

Quantum-enhanced joint estimation of phase and phase diffusion

Quantum-enhanced joint estimation of phase and phase diffusion

CHSH Bell tests for optical hybrid entanglement

Enhancing free space DI QKD via employing NPA hierarchy method

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