What is actually needed to quantum-compute with harmonic oscillators? / Dr. Hoi-Kwan Lau

Description

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 basis of a qubit; 3) Implement logic gates by engineering en coding-specific interaction. In our recent works, w e show 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 [2]. The for malism permits a new class of encoding that a pure logical qubit is represented by a mixed physical state [1]. Because the purity of quantum system is not essent ial, the requirement of ground-state cooling can be relaxed. Additionally, our formalism can reduce the initial isation energy, and protect the logical qubit against a wid er class of noise. Reference: [1] Hoi-Kwan Lau and Martin B. Plenio, arXiv:1608.0 3213 [2] Hoi-Kwan Lau and Martin B. Plenio, Physical Rev iew Letters 117, 100501 (2016)

Period	02 May 2017
Event type	Guest talk
Location	AustriaShow on map