Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session R17: Focus Session on Modular, Distributed Quantum Computing: Protocols and Architecture DesignFocus
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Sponsoring Units: DQI Chair: Martin Suchara, Argonne Natl Lab Room: 203 |
Thursday, March 5, 2020 8:00AM - 8:36AM |
R17.00001: Multiplexing quantum modules in computational and communication systems. Invited Speaker: Kae Nemoto There are many advantages to processing quantum information in a distributed fashion. The technology required to connect multiple quantum computers together provides an ideal way to naturally scale up one’s computational resources. Such a feature is now standard in the classical domain; however, quantum information systems fundamentally differ from their classical counterparts in several ways. It is these differences that bring unique advantages to the distributed quantum information processing realm. Distributed quantum information systems are decomposed into modules, the fundamental building block of such systems. Adding more modules significantly increases the computational resource. The modules are simple enough to be able fully characterizable and merge quantum communication and computation approaches together. They give an architecture free technology. In this talk, we focus on these unique features of distributed quantum information processing and give a few examples of how we can implement various protocols and architecture for quantum computation and communications with an NV-based quantum module. Further we illustrate the unique advantage quantum multiplexing enables. |
Thursday, March 5, 2020 8:36AM - 8:48AM |
R17.00002: Designing Scalable Quantum Network Architectures Martin Suchara, Joaquin F Chung Miranda, Rajkumar Kettimuthu, Alexander Kolar, Xiaoliang Wu, Tian Zhong Simulation-driven design is an essential tool in the development of quantum communication networks. In the past few years experimental quantum network demonstrations moved from table-top experiments to metropolitan-scale deployments and long-distance repeater network prototypes. As the number of optical components in these experiments increases, simulations simplify experiment planning and allow comparisons of alternative network architectures. In this work we use simulations to quantify the performance of networks with quantum router and repeater nodes. Our simulator of quantum network communication, called SeQUeNCe, performs simulations at the individual photon level with picosecond resolution. Faithful evaluations are achieved by modeling interactions between the physical layer, control protocols, and applications. We implement simplified models of optical components and the control protocol stack. End-to-end performance is evaluated for quantum key distribution and quantum state teleportation applications, and correctness of our models is partially validated by comparing against prior experimental results. |
Thursday, March 5, 2020 8:48AM - 9:00AM |
R17.00003: Routing in a quantum network William Munro, Nicolo Lo Piparo, Michael Hanks, Kae Nemoto It is now well known that quantum physics offers novel ways for information communication. It is expected that these principles will lead to a quantum enabled internet supporting new communication, computation and metrologocial tasks. Given the global nature of such an internet, it is clear that quantum repeaters will play an essential role in both its development and abilities. As such the efficient routing of quantum (and classical) signals will be paramount. |
Thursday, March 5, 2020 9:00AM - 9:12AM |
R17.00004: A novel approach towards designing and structuring Quantum Communication devices and Quantum information processing. Aditya Chinchole A completely new approach to quantum computation and simulation has been devised. Looking into various methods like Trapped ion, quantum communication with microwave photons, space division multiplexing optical fibre and comparing these methods to know the best suitable technique for information processing. A modified quantum information processing system is also stated in this paper. Efficient and simple techniques are also studied in depth for optical fibre communication. |
Thursday, March 5, 2020 9:12AM - 9:24AM |
R17.00005: Towards inter-city entanglement generation using solid state spins in diamond. Arian Stolk, Jaco Morits, Erwin van Zwet, Ronald Hagen, Ad Verlaan, Matthew Weaver, Ronald Hanson Large scale networks where entanglement is generated and exploited between nodes are of great interest for both practical applications as well as fundamental tests of nature[1]. The NV-centre in diamond provides an excellent platform for realizing such a network, with recent work demonstrating fast entanglement generation[2] and entanglement between the NV-centre qubit and a telecom photon [3]. In this talk I will show latest experimental progress towards generating entanglement between two Dutch cities via 30km of fibre. This experiment will be the first link in a metropolitan scale quantum network in the Netherlands, which will serve as a test bed for the development of the Quantum Internet. |
Thursday, March 5, 2020 9:24AM - 9:36AM |
R17.00006: Entanglement Certification in Witness Experiments with Arbitrary Noise Bas Dirkse, Matteo Pompili, Ronald Hanson, Michael Walter, Stephanie Wehner Entanglement is a fundamental property of quantum mechanical systems and an essential resource for quantum network applications. Carefully certifying entanglement is therefore an important task that is often achieved using entanglement witness experiments. Given only finite trials, the statistical confidence is typically expressed as the number of observed standard deviations of witness violations. This method implicitly assumes that the noise is well-behaved so that the central limit theorem applies. |
Thursday, March 5, 2020 9:36AM - 9:48AM |
R17.00007: Scalability Analysis Of Atomic Ensemble Based Quantum Repeaters Using The NetSquid Simulator David Maier, Julian Rabbie, Filip Rozpedek, Guus Avis, Tim Coopmans, Axel Dahlberg, Ariana Torres, Walter de Jong, Loek Nijsten, Martijn Papendrecht, Julio de Oliveiro Filho, David Elkouss, Rob Knegjens, Stephanie Wehner A Quantum Internet will enable new applications that are provably impossible with classical communication alone. However, the optical fibers used to carry the quantum information are inherently lossy. To overcome the exponential losses over distance so-called quantum repeaters are needed to amplify the signal. |
Thursday, March 5, 2020 9:48AM - 10:00AM |
R17.00008: Verifiable Hybrid Secret Sharing With Few Qubits Victoria Lipinska, Gláucia Murta, Jeremy Ribeiro, Stephanie Wehner We consider the task of sharing a secret quantum state in a quantum network in a verifiable way. We propose a protocol that achieves this task, while reducing the number of required qubits, as compared to the existing protocols. To achieve this, we combine classical encryption of the quantum secret with an existing verifiable quantum secret sharing scheme based on Calderbank-Shor-Steane quantum error correcting codes. In this way we obtain a verifiable hybrid secret sharing scheme for sharing a qubit, which combines the benefits of quantum and classical schemes. Our scheme attains maximum secrecy allowed by quantum mechanics. Moreover, each of the n nodes holds only single-qubit shares and requires workspace of at most 3n qubits at a time to verify the quantum secret. Furthermore, we define a ramp verifiable hybrid scheme. We give explicit examples of ramp schemes and schemes achieving maximum secrecy based on existing quantum error correcting codes. Finally, we prove that our protocol is secure in the presence of an active non-adaptive adversary. |
Thursday, March 5, 2020 10:00AM - 10:12AM |
R17.00009: Deterministic entanglement between non-interacting systems with linear optics Leigh Martin, Birgitta K Whaley Measurement-based heralded entanglement schemes provide the primary method to entangle physically separated nodes in most quantum systems. However, the impossibility of performing a deterministic Bell measurement with linear optics bounds the success rate of these protocols to at most 50%. Here we show that the ability to perform feedback during the measurement process enables unit success probability in a single shot. Our primary feedback protocol, based on photon counting, retains the same robustness as the standard Barrett-Kok scheme, while doubling the success probability even in the presence of loss. Furthermore, it generalizes to creation of distributed $N$-particle Dicke states. In superconducting circuits, for which homodyne detectors are more readily available than photon counters, we give another protocol that can deterministically entangle remote qubits given realistic parameters. In constructing the latter protocol, we derive a general expression for locally optimal control that applies to any continuous feedback problem. |
Thursday, March 5, 2020 10:12AM - 10:24AM |
R17.00010: Protocols for creating and purifying GHZ states Sebastian de Bone, Runsheng Ouyang, Kenneth Goodenough, David Elkouss The distribution of high quality Greenberger-Horne-Zeilinger (GHZ) states is at the heart of many applications in quantum information and the upcoming quantum internet, ranging from extending the baseline of telescopes to secret sharing. They also play an important role in error-correction architectures for distributed quantum computation, where EPR pairs are leveraged to create an entangled network of quantum computers. |
Thursday, March 5, 2020 10:24AM - 10:36AM |
R17.00011: Constraints on continuous variable entanglement swapping in the presence of photon loss Alex Kwiatkowski, Ezad Shojaee, Scott Glancy, Emanuel H Knill In many procedures for entanglement swapping in the continuous variable domain the entangling measurement is quadrature measurement of linear mixtures of the two modes sent by the two parties that wish to swap entanglement. In the presence of sufficient photon loss, which we model as a fictitious beamsplitter with the environment on each of the two modes, we show that such a measurement cannot be used to swap entanglement. We show analytically that if the modes sent by the two parties suffer losses that average between them to 50% or more, then any passive linear circuit followed by quadrature measurement has a separable POVM on those modes and therefore cannot be used to perform entanglement swapping. We will also discuss the case where the constraints on the measurement are relaxed to include arbitrary Gaussian resources. |
Thursday, March 5, 2020 10:36AM - 10:48AM |
R17.00012: Quantum Control through Optical Nonlinearities for Error Corrected One-way Quantum Repeaters Stefan Krastanov, Mikkel Heuck, Kurt Jacobs, Prineha Narang, Dirk R. Englund The use of exclusively optical modes for quantum communication and quantum computing is intriguing due to its potential to work at room temperatures. However, restricting architectures to only optical modes (i.e. quantum harmonic oscillators with simple couplings), leaves very few knobs available for the control of such systems. We present how the couplings between multiple optical modes, mediated by material nonlinearities, enable the performance of error correction and logical operations for a number of small bosonic error correcting codes. This high level of control is achieved through designing arbitrary pulse shapes for the classical laser light used to trigger the resonant nonlinear interaction between multiple quantum modes. This would enable one-way quantum repeaters with error correction and is a necessary step for room-temperature quantum photonic information processing. |
Thursday, March 5, 2020 10:48AM - 11:00AM |
R17.00013: Entanglement of a pair of quantum emitters under continuous fluorescence measurements Philippe Lewalle, Cyril Elouard, Sreenath Kizhakkumpurath Manikandan, Xiao-Feng Qian, J H Eberly, Andrew N Jordan
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