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Researchers are fabricating quantum processors powerful enough to execute small instances of quantum algorithms. Scalability concerns are motivating distributed-memory multicomputer architectures, and experimental efforts have demonstrated some of the building blocks for such a design. Numberous systems are emerging with the goal of enabling local and distributed quantum computing.
We provide a basic introduction of the core ideas and theory surrounding fault-tolerant quantum computation. Quantum fault-tolerance essentially refers to avoiding the uncontrollable cascade of errors caused by the interaction of quantum-bits. The presented concepts underlay the theoretical framework of large-scale quantum computation and are the driving force for many recent experimental efforts...
We demonstrate an entanglement mapping based characterisation protocol for coupled-qubit Hamiltonians. This is achieved by generating and measuring time-evolved states relevant to an NV-diamond system, using a reconfigurable integrated optical device.
We present a simple design of a quantum repeater design build from single NV- centers embedded in an optical cavity. We compare different quantum networks from a simple linear chain to a fully fault-tolerant quantum internet.
We introduce a design a design for a quantum memory stick that uses active quantum error correction to coherently store a qubit of encoded information for months or years. This device is based on the model of topological error correction and can increase the storage time of a qubit of information by 10–11 orders of magnitude with a physical qubit overhead of several hundreds.
We detail how resource estimates should be made for large scale, error corrected computation. We detail the series of steps needed when compiling algorithms and illustrate how to estimate the qubit/time requirements of any computation.
In recent years, NV centers in diamond has attracted significant attention as a candidate for quantum information devices. The negatively charged NV center, in particular, has been intensely investigated [1-3]. NV− centers host both an electron spin qubit and a nitrogen nuclear spin, in our case a nuclear spin-1/2 of 15N is imbedded. The ground state of the electron spin qubit has a long coherence...
We propose a model of quantum information devices based on an optical cavity with an NV centre. These devices can be easily modified to accommodate imperfections such as photon loss, maintaining the feasibility and scalability.
Efficient generation of spatially delocalised entangledstates is at the heart of quantum information science. Generally,flying qubits are proposed for long range entangling interactions,however here we introduce a bus-mediated alternative for this task.Our scheme permits efficient and flexible generation ofdeterministic two-qubit operator measurements and has links to theimportant concepts of mode-entanglement...
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