arXiv subjects

Daniel Kuan Li Oi

Publications and source records attributed to Daniel Kuan Li Oi.

3 recordsLinked to original sources

arXiv2014

Unitary Holonomies by Direct Degenerate Projections

An incomplete quantum measurement can induce non-trivial dynamics between degenerate subspaces, a closed sequence of such projections produces a non-abelian holonomy. We show how to induce unitary evolution on an initial subspace from such finite discrete sequences and also construct a near deterministic repeat-until-success protocol. We also prove necessary and sufficient criteria on the auxiliary Hilbert space dimension required for inducing isometries between between subspaces.

quant-ph↗

arXiv2013

Ancilla Driven Quantum Computation with arbitrary entangling strength

We extend the model of Ancilla Driven Quantum Computation (ADQC) by considering gates with arbitrary entangling power. By giving up stepwise determinism, universal QC can still be achieved through a variable length sequence of single qubit gates and probabilistic "repeat-until-success" entangling operations. This opens up a new range of possible physical implementations as well as shedding light on the sets of resources sufficient for universal QC.

quant-ph↗

arXiv2002

Quantum Cryptography Based On Bell Inequalities for Three-Dimensional System

We present a crytographic protocol based upon entangled qutrit pairs. We analyse the scheme under a symmetric incoherent attack and plot the region for which the protocol is secure and compare this with the region of violations of certain Bell inequalities.

quant-ph↗