Entangling remote qubits using the single-photon protocol: an in-depth theoretical and experimental study

Hermans, Sophie; Pompili, Matteo; Martins, Laura dos Santos; Montblanch, Alejandro Rodriguez-Pardo; Beukers, Hans; Baier, Simon; Borregaard, Johannes; Hanson, Ronald K.

doi:10.1088/1367-2630/acb004

Cited by 17 publications

(1 citation statement)

References 43 publications

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“…In the case of a very small p suc , one might want to perform entanglement attempts in batches in order to minimise overhead due to communication with higher layers of the software stack (which must be notified when there is, or is not, a success). This scheme has been implemented with NV centres in diamond, where typically p suc ≪ 1 [35]. If this is the case, choosing one time step to correspond to a batch of M ≪ 1/(p suc ) 2 attempts, the probability of producing at least one entangled link in a time step is…”

Section: Appendix D (Trade-off Function Due To Entanglement Generatio...mentioning

confidence: 99%

Tools for the Analysis of Quantum Protocols Requiring State Generation Within a Time Window

Davies,

Beauchamp,

Vardoyan

et al. 2024

IEEE Trans. Quantum Eng.

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Quantum protocols commonly require a certain number of quantum resource states to be available simultaneously. An important class of examples is quantum network protocols that require a certain number of entangled pairs. Here, we consider a setting in which a process generates a quantum resource state with some probability p in each time step, and stores it in a quantum memory that is subject to timedependent noise. To maintain sufficient quality for an application, each resource state is discarded from the memory after w time steps. Let s be the number of desired resource states required by a protocol. We characterise the probability distribution X (w,s) of the ages of the quantum resource states, once s states have been generated in a window w. Combined with a time-dependent noise model, knowledge of this distribution allows for the calculation of fidelity statistics of the s quantum resources. We also give exact solutions for the first and second moments of the waiting time τ (w,s) until s resources are produced within a window w, which provides information about the rate of the protocol. Since it is difficult to obtain general closed-form expressions for statistical quantities describing the expected waiting time E(τ (w,s) ) and the distribution X (w,s) , we present two novel results that aid their computation in certain parameter regimes. The methods presented in this work can be used to analyse and optimise the execution of quantum protocols. Specifically, with an example of a Blind Quantum Computing (BQC) protocol, we illustrate how they may be used to infer w and p to optimise the rate of successful protocol execution. INDEX TERMS Quantum networks, performance analysis, scan statisticsThis article has been accepted for publication in IEEE Transactions on Quantum Engineering.

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Section: Appendix D (Trade-off Function Due To Entanglement Generatio...mentioning

confidence: 99%

Tools for the Analysis of Quantum Protocols Requiring State Generation Within a Time Window

Davies,

Beauchamp,

Vardoyan

et al. 2024

IEEE Trans. Quantum Eng.

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Coherent Microwave, Optical, and Mechanical Quantum Control of Spin Qubits in Diamond

Orphal‐Kobin,

Torun,

Bopp

et al. 2024

Adv Quantum Tech

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Diamond has emerged as a highly promising platform for quantum network applications. Color centers in diamond fulfill the fundamental requirements for quantum nodes: they constitute optically accessible quantum systems with long‐lived spin qubits. Furthermore, they provide access to a quantum register of electronic and nuclear spin qubits and they mediate entanglement between spins and photons. All these operations require coherent control of the color center's spin state. This review provides a comprehensive overview of the state‐of‐the‐art, challenges, and prospects of such schemes, including high‐fidelity initialization, coherent manipulation, and readout of spin states. Established microwave and optical control techniques are reviewed, and moreover, emerging methods such as cavity‐mediated spin–photon interactions and mechanical control based on spin–phonon interactions are summarized. For different types of color centers, namely, nitrogen–vacancy and group‐IV color centers, distinct challenges persist that are subject of ongoing research. Beyond fundamental coherent spin qubit control techniques, advanced demonstrations in quantum network applications are outlined, for example, the integration of individual color centers for accessing (nuclear) multiqubit registers. Finally, the role of diamond spin qubits in the realization of future quantum information applications is described.

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Programmable photonic integrated meshes for modular generation of optical entanglement links

et al. 2023

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Large-scale generation of quantum entanglement between individually controllable qubits is at the core of quantum computing, communications, and sensing. Modular architectures of remotely-connected quantum technologies have been proposed for a variety of physical qubits, with demonstrations reported in atomic and all-photonic systems. However, an open challenge in these architectures lies in constructing high-speed and high-fidelity reconfigurable photonic networks for optically-heralded entanglement among target qubits. Here we introduce a programmable photonic integrated circuit (PIC), realized in a piezo-actuated silicon nitride (SiN)-in-oxide CMOS-compatible process, that implements an N × N Mach–Zehnder mesh (MZM) capable of high-speed execution of linear optical transformations. The visible-spectrum photonic integrated mesh is programmed to generate optical connectivity on up to N = 8 inputs for a range of optically-heralded entanglement protocols. In particular, we experimentally demonstrated optical connections between 16 independent pairwise mode couplings through the MZM, with optical transformation fidelities averaging 0.991 ± 0.0063. The PIC’s reconfigurable optical connectivity suffices for the production of 8-qubit resource states as building blocks of larger topological cluster states for quantum computing. Our programmable PIC platform enables the fast and scalable optical switching technology necessary for network-based quantum information processors.

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Entangling remote qubits using the single-photon protocol: an in-depth theoretical and experimental study

Cited by 17 publications

References 43 publications

Tools for the Analysis of Quantum Protocols Requiring State Generation Within a Time Window

Tools for the Analysis of Quantum Protocols Requiring State Generation Within a Time Window

Coherent Microwave, Optical, and Mechanical Quantum Control of Spin Qubits in Diamond

Programmable photonic integrated meshes for modular generation of optical entanglement links

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