Abstract
We explore the potential application of graphene-based qubits in photonic quantum communications. In particular, the valley pair qubit in double quantum dots of gapped graphene is investigated as a quantum memory in the implementation of quantum repeaters. For the application envisioned here, our work extends the recent study of the qubit (Wu et al., arXiv: 1104.0443; Phys. Rev. B 84, 195463 (2011)) to the case where the qubit is placed in a normal magnetic field-free configuration. It develops, for the configuration, a method of qubit manipulation, based on a unique AC electric field-induced, valley-orbit interaction-derived mechanism in gapped graphene. It also studies the optical response of graphene quantum dots in the configuration, in terms of valley excitation with respect to photonic polarization, and illustrates faithful photon \leftrightarrow valley quantum state transfers. This work suggests the interesting prospect of an all-graphene approach for the solid state components of a quantum network, e.g., quantum computers and quantum memories in communications.
Highlights
Quantum bits are the fundamental units of quantum information exchanged in quantum communications (QCs) [1,2] or processed in quantum computing [3]
[7] in order to facilitate an analytical 11 study of the valley-orbit interaction (VOI)-based effect, we focus here on the regime where the electron is near the conduction band edge, i.e., E/Δ
The method is based on the 2nd-order relativistic type effect in gapped graphene involving the valley-orbit interaction, and is able to operate in the time scale of O(10ns)
Summary
Quantum bits (qubits) are the fundamental units of quantum information exchanged in quantum communications (QCs) [1,2] or processed in quantum computing [3]. Reference 5 develops, for the valley pair qubit, a method of quantum state manipulation suited to the implementation of valley-based quantum computing It employs a static tilted magnetic field configuration, where the in-plane field freezes the electron spin while the normal field induces an asymmetry between K and K' valleys, creating a corresponding “valley Zeeman splitting” [11,12].
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