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Chinese Control Conference (CCC)

Two-qubit entanglement generation with trapped ions

Xiaozhen Ge, Zairong Xi

Published Jul 1, 2016• 0 citations
Publisher

Abstract

Many schemes have been proposed for entangling two trapped-ion qubits. Qubit states are coupled to external motion of the trapped ions through the interaction between the ions and optical fields, which is the key to producing the entanglement. This paper mainly aims to reviewing some typical quantum gates as well as their pros and cons. Distinct schemes by designing dissipative processes are also refered to briefly.

DOI
10.1109/chicc.2016.7554813

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•Jan 1, 2015•1 citation
Many schemes have been proposed for entangling two trapped-ion qubits. Qubit states are coupled to external motion of the trapped ions through the interaction between the ions and optical fields, which is the key to producing the entanglement. This paper mainly aims to reviewing some typical quantum gates as well as their pros and cons. Distinct schemes by designing dissipative processes are also refered to briefly.
We propose a scheme to perform basic gates of quantum computing and prepare entangled states in a system with cold trapped ions located in a single-mode optical cavity. General quantum computing can be done with both the motional state of the trapped ion and cavity state being qubits. We can also generate different kinds of entangled states in such a system without state reduction, and can transfer quantum states from an ion in one trap to an ion in another trap. The experimental requirements for achieving our scheme are discussed.
Entangled states are a key resource in fundamental quantum physics, quantum cryptography, and quantum computation. In this thesis, we focus on the demonstrations of two novel methods to generate entanglement. First, we implement dissipative production of a maximally entangled steady state on two trapped ions. Dissipative and coherent processes are combined and implemented in a continuous time-independent fashion, analogous to optical pumping of atomic states, continuously driving the system towards the steady entangled state. With this method, we obtain a Bell state fidelity up to 0.89(2). Second, we propose and demonstrate a novel coherent process to confine quantum evolution in a subspace between an initial separable state and the target entangled state. We demonstrate this scheme on two and three ions obtaining a Bell state fidelity up to 0.992(2). Both of these methods are robust against certain types of experimental noise and decoherence. Additionally, we demonstrate sympathetic cooling of ion chains to near the ground\nstate of motion with an electromagnetically-induced-transparency (EIT) method. This results in roughly an order of magnitude faster cooling time while using significantly lower laser power compared to the conventional resolved sideband cooling method. These techniques may be helpful for scaled-up quantum computing.