Engineering optical hybrid entanglement between discrete- and continuous-variable states

Huang, Kun; Jeannic, Hanna Le; Morin, Olivier; Darras, Tom; Guccione, Giovanni; Cavaillès, Adrien; Laurat, Julien

doi:10.1088/1367-2630/ab34e7

Cited by 44 publications

(36 citation statements)

References 55 publications

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“…The mathematical approximations we utilize will have high fidelity with Equation () and will allow for improved analytical insight. Deviation from results produced using Equation () directly will be inconsequential 7,31,32 . Our main interest will be large cat states, as they tend to be of wider interest in a range of quantum information protocols, such as information processing 33 .…”

Section: Hybrid Entanglementmentioning

confidence: 99%

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Satellite‐based distribution of hybrid entanglement

Malaney

Green

2021

Quantum Engineering

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Heterogeneousquantum networks consisting of mixed‐technologies—continuous variable (CV) and discrete variable (DV)—will become ubiquitous as global quantum communication matures. Hybrid quantum‐entanglement between CV and DV modes will be a critical resource in such networks. A leading candidate for such hybrid quantum entanglement is that between Schrödinger‐cat states and photon‐number states. In this work, we explore, for the first time, the use of two‐mode squeezed vacuum (TMSV) states, distributed from satellites, as a teleportation resource for the redistribution of our candidate hybrid entanglement prestored within terrestrial quantum networks. We determine the loss conditions under which teleportation via the TMSV resource outperforms direct‐satellite distribution of the hybrid entanglement, in addition to quantifying the advantage of teleporting the DV mode relative to the CV mode. Our detailed calculations show that under the loss conditions anticipated from low‐Earth‐orbit, DV teleportation via the TMSV resource will always provide for significantly improved outcomes, relative to other means for distributing hybrid entanglement within heterogeneous quantum networks.

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Section: Hybrid Entanglementmentioning

confidence: 99%

“…When

| α_{0} | > 1

, the states in mode C can be approximated by coherent states, and our hybrid entangled state becomes 7,31

| ψ ⟩_{h}^{(l a r g e)} \approx \frac{| α_{0} ⟩_{C} | + ⟩_{D} - | - α_{0} ⟩_{C} | - ⟩_{D}}{\sqrt{2}} .

…”

Section: Hybrid Entanglementmentioning

confidence: 99%

Satellite‐based distribution of hybrid entanglement

Malaney

Green

2021

Quantum Engineering

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“…The hybrid entangled state is produced by combining the tapped beam from OPO I and the idler beam from OPO II and projecting them onto the same mode with a polarizing beamsplitter. The state, heralded on SNSPD , is maximally entangled when the polarizations before the beamsplitter are rotated to have equal counts from each OPO (16). This balancing condition places a constrain on the relative counts on the other port of the beamsplitter.…”

Section: Quantum State Engineeringmentioning

confidence: 99%

“…These advances spurred intense experimental and theoretical efforts toward novel protocols, including deterministic teleportation of photonic qubits (12) or witnesses for single-photon entanglement based on CV homodyne measurements (13). More recently, the engineering of hybrid entanglement of light (14)(15)(16), i.e., entanglement between particle-and wave-like optical qubits, enabled remote state preparation (17) and teleportation between different encodings (18,19). This entangle-ment was also certified for use in one-sided device-independent protocols (20).…”

Section: Introductionmentioning

confidence: 99%

Connecting heterogeneous quantum networks by hybrid entanglement swapping

et al. 2020

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Recent advances in quantum technologies are rapidly stimulating the building of quantum networks. With the parallel development of multiple physical platforms and different types of encodings, a challenge for present and future networks is to uphold a heterogeneous structure for full functionality and therefore support modular systems that are not necessarily compatible with one another. Central to this endeavor is the capability to distribute and interconnect optical entangled states relying on different discrete and continuous quantum variables. Here, we report an entanglement swapping protocol connecting such entangled states. We generate single-photon entanglement and hybrid entanglement between particle- and wave-like optical qubits and then demonstrate the heralded creation of hybrid entanglement at a distance by using a specific Bell-state measurement. This ability opens up the prospect of connecting heterogeneous nodes of a network, with the promise of increased integration and novel functionalities.

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“…Examples are quantum teleportation of a DV using CV protocol [14] or the teleportation of CV qubit to qubit [15], quantum repeater using hybrid protocol [76] or building on-chip integrated circuits [77]. Hybrid optical states have been generated experimentally to entangle the DV and CV [16][17][18][19][78][79][80][81][82][83][84]. Therefore, a natural question arises about whether and up to what extent we can induce the nonlinear effects of RI all-optically.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Rabi interactions with traveling states of light

2020

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Keywords: quantum non-Gaussian states of light, quantum optics with photon addition and subtraction, hybrid discrete-continuousvariable quantum information, measurement-induced quantum operations Abstract Hybrid interactions between light and two-level systems and their nonlinear nature are crucial components of advanced quantum information processing and quantum networks. Rabi interaction (RI) exhibits the hybrid nonlinear nature, but its implementation is challenging at optical frequencies where the rotating wave approximation (RWA) is valid. Here, we propose a setup to conditionally induce RI between discrete variable and continuous variable of traveling beams of light. We show that our scheme can generate RI on weak states of light, where signatures of the nonlinear quantum effects are preserved for typical experimental losses. These results prove that a hybrid RI can be realized in all-optical setups, and open a way to experimental investigations of nonlinear quantum optics beyond RWA.

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Engineering optical hybrid entanglement between discrete- and continuous-variable states

Cited by 44 publications

References 55 publications

Satellite‐based distribution of hybrid entanglement

Satellite‐based distribution of hybrid entanglement

Connecting heterogeneous quantum networks by hybrid entanglement swapping

Hybrid Rabi interactions with traveling states of light

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