What is actually needed to quantum-compute with harmonic oscillators? / Dr. Hoi-Kwan Lau
Sprache des Titels:
To implement quantum computers on harmonic-oscillat
or-liked systems, the conventional
approach is to: 1) Cool the system to the ground st
ate; 2) Specify two physical states as the encoding
a qubit; 3) Implement logic gates by engineering en
coding-specific interaction. In our recent works, w
that all of these procedures are sufficient but not
necessary. Specifically, we find a unified operati
on that can
implement logic gates for any encoding . The for
malism permits a new class of encoding that a pure
qubit is represented by a mixed physical state .
Because the purity of quantum system is not essent
requirement of ground-state cooling can be relaxed.
Additionally, our formalism can reduce the initial
energy, and protect the logical qubit against a wid
er class of noise.
 Hoi-Kwan Lau and Martin B. Plenio, arXiv:1608.0
 Hoi-Kwan Lau and Martin B. Plenio, Physical Rev
iew Letters 117, 100501 (2016)