Quantum information processing
View article
Superconducting nanowire single-photon detectors for quantum information Open
The superconducting nanowire single-photon detector (SNSPD) is a quantum-limit superconducting optical detector based on the Cooper-pair breaking effect by a single photon, which exhibits a higher detection efficiency, lower dark count rat…
View article
General Resource Theories in Quantum Mechanics and Beyond: Operational Characterization via Discrimination Tasks Open
We establish an operational characterization of general convex resource\ntheories -- describing the resource content of not only states, but also\nmeasurements and channels, both within quantum mechanics and in general\nprobabilistic theor…
View article
Coherence-assisted single-shot cooling by quantum absorption refrigerators Open
The extension of thermodynamics into the quantum regime has received much\nattention in recent years. A primary objective of current research is to find\nthermodynamic tasks which can be enhanced by quantum mechanical effects. With\nthis g…
View article
Time-multiplexed heralded single-photon source Open
Photons have proven to be excellent carriers of quantum information, and play\nessential roles in numerous quantum information processing (QIP) applications.\nIn particular, heralded single- photon sources via spontaneous parametric-down\n…
View article
Simultaneous blockade of a photon, phonon, and magnon induced by a two-level atom Open
The hybrid microwave optomechanical-magnetic system has recently emerged as a promising candidate for coherent information processing because of the ultrastrong microwave photon-magnon coupling and the longlife of the magnon and phonon. As…
View article
Coupling a Superconducting Quantum Circuit to a Phononic Crystal Defect Cavity Open
Connecting nanoscale mechanical resonators to microwave quantum circuits\nopens new avenues for storing, processing, and transmitting quantum\ninformation. In this work, we couple a phononic crystal cavity to a tunable\nsuperconducting qua…
View article
Splash, pop, sizzle: Information processing with phononic computing Open
Phonons, the quanta of mechanical vibration, are important to the transport of heat and sound in solid materials. Recent advances in the fundamental control of phonons (phononics) have brought into prominence the potential role of phonons …
View article
Robust entangling gate for polar molecules using magnetic and microwave fields Open
Polar molecules are an emerging platform for quantum technologies based on their long-range electric dipole–dipole interactions, which open new possibilities for quantum information processing and the quantum simulation of strongly correla…
View article
Efficient Verification of Pure Quantum States in the Adversarial Scenario Open
Efficient verification of pure quantum states in the adversarial scenario is crucial to many applications in quantum information processing, such as blind measurement-based quantum computation and quantum networks. However, little is known…
View article
Limits on Correlations in Networks for Quantum and No-Signaling Resources Open
A quantum network consists of independent sources distributing entangled\nstates to distant nodes which can then perform entangled measurements, thus\nestablishing correlations across the entire network. But how strong can these\ncorrelati…
View article
Electron quantum optics as quantum signal processing Open
The recent developments of electron quantum optics in quantum Hall edge channels have given us new ways to probe the behavior of electrons in quantum conductors. It has brought new quantities called electronic coherences under the spotligh…
View article
Photon blockade in a double-cavity optomechanical system with nonreciprocal coupling Open
Photon blockade is an effective way to generate single photon, which is of great significance in quantum state preparation and quantum information processing. Here we investigate the statistical properties of photons in a double-cavity opt…
View article
Experimental quantum key distribution with simulated ground-to-satellite photon losses and processing limitations Open
Quantum key distribution (QKD) has the potential to improve communications security by offering cryptographic keys whose security relies on the fundamental properties of quantum physics. The use of a trusted quantum receiver on an orbiting…
View article
Towards Device-Independent Information Processing on General Quantum Networks Open
The violation of certain Bell inequalities allows for device-independent information processing secure against non-signalling eavesdroppers. However, this only holds for the Bell network, in which two or more agents perform local measureme…
View article
Experimental Minimum-Error Quantum-State Discrimination in High Dimensions Open
Quantum mechanics forbids perfect discrimination among nonorthogonal states through a single shot measurement. To optimize this task, many strategies were devised that later became fundamental tools for quantum information processing. Here…
View article
The resurgence of the linear optics quantum interferometer — recent advances & applications Open
© 2019 Linear optics has seen a resurgence for applications in quantum information processing owing to its miniaturisation on-chip, and increase in production efficiency and quality of single photons. Time-bin encodings have also become fe…
View article
Autonomous multipartite entanglement engines Open
The generation of genuine multipartite entangled states is challenging in\npractice. Here we explore a new route to this task, via autonomous entanglement\nengines which use only incoherent coupling to thermal baths and\ntime-independent i…
View article
Toward optical quantum information processing with quantum dots coupled to microstructures [Invited] Open
Major improvements have been made on semiconductor quantum dot light sources recently and now they can be seen as a serious candidate for near-future scalable photonic quantum information processing experiments. The three key parameters of…
View article
Optically detected magnetic resonance of high-density ensemble of NV<sup>−</sup>centers in diamond Open
Optically detected magnetic resonance (ODMR) is a way to characterize the ensemble of NV-centers. Recently, a remarkably sharp dip was observed in the ODMR with a high-density ensemble of NV centers. The model (Zhu et al 2014 Nat. Commun. …
View article
Nearly Deterministic Bell Measurement for Multiphoton Qubits and its Application to Quantum Information Processing Open
We propose a Bell-measurement scheme by employing a logical qubit in Greenberger-Horne-Zeilinger entanglement with an arbitrary number of photons. Remarkably, the success probability of the Bell measurement as well as teleportation of the …
View article
Quantum Information Processing With Frequency-Comb Qudits Open
Classical optical frequency combs have revolutionized a myriad of fields, from optical spectroscopy and optical clocks to arbitrary microwave synthesis and lightwave communication. Capitalizing on the inherent robustness and high dimension…
View article
Experimental bilocality violation without shared reference frames Open
Nonclassical correlations arising in complex quantum networks are attracting growing interest, both from a
\nfundamental perspective and for potential applications in information processing. In particular, in an entanglement swapping scena…
View article
Quantum information processing in phase space: A modular variables approach Open
Binary quantum information can be fault tolerantly encoded in states defined in infinite dimensional Hilbert spaces. Such states define a computational basis, and permit a perfect equivalence between continuous and discrete universal opera…
View article
Purcell-enhanced optical spin readout of nitrogen-vacancy centers in diamond Open
Nitrogen-Vacancy (NV) color centers in diamond have emerged as promising\nquantum solid-state systems, with applications ranging from quantum information\nprocessing to magnetic sensing. One of the most useful properties of NVs is the\nabi…
View article
Quantum Nondemolition Measurements with Optical Parametric Amplifiers for Ultrafast Universal Quantum Information Processing Open
Realization of a room-temperature ultrafast photon-number-resolving quantum nondemolition (QND) measurement would have significant implications for photonic quantum information processing, enabling, for example, deterministic quantum compu…
View article
Quantum speed limits for quantum-information-processing tasks Open
We derive algebraic bounds on achievable rates for quantum state transfer and\nentanglement generation in general quantum systems. We apply these bounds to\ngraph-based models of local quantum spin systems to obtain speed limits on\nthese …
View article
Sub-kilohertz excitation lasers for quantum information processing with Rydberg atoms Open
Quantum information processing using atomic qubits requires narrow linewidth\nlasers with long-term stability for high fidelity coherent manipulation of\nRydberg states. In this paper, we report on the construction and\ncharacterization of…
View article
Experimental investigation of partially entangled states for device-independent randomness generation and self-testing protocols Open
Previous theoretical works showed that all pure two-qubit entangled states can generate one bit of local randomness and can be self-tested through the violation of proper Bell inequalities. We report an experiment in which nearly pure part…
View article
Characterizing quantum networks: Insights from coherence theory Open
Networks based on entangled quantum systems enable interesting applications\nin quantum information processing and the understanding of the resulting\nquantum correlations is essential for advancing the technology. We show that\nthe theory…
View article
Beyond Bits: A Review of Quantum Embedding Techniques for Efficient Information Processing Open
The existing body of research on quantum embedding techniques is not only confined in scope but also lacks a comprehensive understanding of the intricacies of the quantum embedding process. To address this critical issue, this article expl…