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10 papers · 2 filters
Ancilla-based quantum simulation
Katherine L. Brown, Suvabrata De, Vivien M. Kendon +1
We consider simulating the BCS Hamiltonian, a model of low temperature superconductivity, on a quantum computer. In particular we consider conducting the simulation on the qubus qu…
Necessity of Superposition of Macroscopically Distinct States for Quantum Computational Speedup
Akira Shimizu, Yuichiro Matsuzaki, Akihisa Ukena
For quantum computation, we investigate the conjecture that the superposition of macroscopically distinct states is necessary for a large quantum speedup. Although this conjecture…
Quantum Tagging: Authenticating Location via Quantum Information and Relativistic Signalling Constraints
Adrian Kent, William J. Munro, Timothy P. Spiller
We define the task of {\it quantum tagging}, that is, authenticating the classical location of a classical tagging device by sending and receiving quantum signals from suitably loc…
Quantum frequency downconversion experiment
Hiroki Takesue
We report the first quantum frequency downconversion experiment. Using the difference frequency generation process in a periodically poled lithium niobate waveguide, we successfull…
Quantum Zeno effect with a superconducting qubit
Yuichiro Matsuzaki, Shiro Saito, Kosuke Kakuyanagi +1
Detailed schemes are investigated for experimental verification of Quantum Zeno effect with a superconducting qubit. A superconducting qubit is affected by a dephasing noise whose…
Reduce, reuse, recycle, for robust cluster state generation
Dominic Horsman, Katherine L. Brown, William J. Munro +1
Efficient generation of cluster states is crucial for engineering large-scale measurement-based quantum computers. Hybrid matter-optical systems offer a robust, scalable path to th…