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We describe in detail the theory underpinning the measurement of density matrices of a pair of quantum two-level systems ͑''qubits''͒. Our particular emphasis is on qubits realized by the two polarization degrees of freedom of a pair of entangled photons generated in a down-conversion experiment; however, the discussion applies in general, regardless of the… (More)

- Kae Nemoto, W J Munro
- Physical review letters
- 2004

We show how to construct a near deterministic CNOT gate using several single photons sources, linear optics, photon number resolving quantum nondemolition detectors, and feed forward. This gate does not require the use of massively entangled states common to other implementations and is very efficient on resources with only one ancilla photon required. The… (More)

- Xiaobo Zhu, Shiro Saito, +10 authors Kouichi Semba
- Nature
- 2011

During the past decade, research into superconducting quantum bits (qubits) based on Josephson junctions has made rapid progress. Many foundational experiments have been performed, and superconducting qubits are now considered one of the most promising systems for quantum information processing. However, the experimentally reported coherence times are… (More)

- Katherine L. Brown, William J. Munro, Vivien M. Kendon
- Entropy
- 2010

- Rodney Van Meter, Kae Nemoto, William J. Munro, Kohei M. Itoh
- 33rd International Symposium on Computer…
- 2006

We evaluate the performance of quantum arithmetic algorithms run on a distributed quantum computer (a quantum multicomputer). We vary the node capacity and I/O capabilities, and the network topology. The tradeoff of choosing between gates executed remotely, through "teleported gates" on entangled pairs of qubits (telegate), versus exchanging the relevant… (More)

- Yuichiro Matsuzaki, Xiaobo Zhu, +8 authors Shiro Saito
- Physical review letters
- 2015

In this Letter, we propose a counterintuitive use of a hybrid system where the coherence time of a quantum system can be significantly improved by coupling it with a system of a shorter coherence time. Coupling a two-level system with a single nitrogen-vacancy (NV^{-}) center, a dark state of the NV^{-} center naturally forms after the hybridization. We… (More)

Linear optics with photon counting is a prominent candidate for practical quantum computing. The protocol by Knill, Laflamme, and Milburn ͓2001, Nature ͑London͒ 409, 46͔ explicitly demonstrates that efficient scalable quantum computing with single photons, linear optical elements, and projective measurements is possible. Subsequently, several improvements… (More)

- Simon J Devitt, William J Munro, Kae Nemoto
- Reports on progress in physics. Physical Society
- 2013

Quantum error correction (QEC) and fault-tolerant quantum computation represent one of the most vital theoretical aspects of quantum information processing. It was well known from the early developments of this exciting field that the fragility of coherent quantum systems would be a catastrophic obstacle to the development of large-scale quantum computers.… (More)

- T. C. Ralph, A. Gilchrist, G.J, Milburn, W. J. Munro, S. Glancy
- 2003

quantum information, Schrödinger cat states, coherent states, conditional measurements We show that quantum computation circuits using coherent states as the logical qubits can be constructed from simple linear networks, conditional photon measurements and " small " coherent superposition resource states. We show that quantum computation circuits using… (More)

- Donna Dodson, Mikio Fujiwara, +24 authors Akihiro Yamamura
- ArXiv
- 2009

Quantum cryptographic technology (QCT) is expected to be a fundamental technology for realizing long-term information security even against as-yet-unknown future technologies. More advanced security could be achieved using QCT together with contemporary cryptographic technologies. To develop and spread the use of QCT, it is necessary to standardize devices,… (More)