Light-shift-induced quantum gates for ions in thermal motion.
نویسندگان
چکیده
An effective interaction between trapped ions in thermal motion can be generated by illuminating them simultaneously with a single laser resonant with the ionic carrier frequency. The ac Stark shift induces simultaneous "virtual" two-phonon transitions via several motional modes. Within a certain laser intensity range these transitions can interfere constructively, resulting in a relatively fast, heating-resistant two-qubit logic gate.
منابع مشابه
Generation of spin-motion entanglement in a trapped ion using long-wavelength radiation
Systems of trapped ions have proven to be an ideal physical system for demonstrating small-scale quantum information processing and quantum simulation [1–5]. By making use of the strong motional coupling between co-trapped ions, numerous different implementations of high-fidelity quantum gates between individual ions have been demonstrated [6–10]. Many of these implementations make use of spin ...
متن کاملTrapped ion quantum computation with transverse phonon modes.
We propose a scheme to implement quantum gates on any pair of trapped ions immersed in a large linear crystal, using interaction mediated by the transverse phonon modes. Compared with the conventional approaches based on the longitudinal phonon modes, this scheme is much less sensitive to ion heating and thermal motion outside of the Lamb-Dicke limit thanks to the stronger confinement in the tr...
متن کاملVacuum induced Stark shifts for quantum logic using a collective system in a high quality dispersive cavity
A collective system of atoms in a high quality cavity can be described by a nonlinear interaction which arises due to the Lamb shift of the energy levels due to the cavity vacuum [Agarwal et al., Phys. Rev. A 56, 2249 (1997)]. We show how this collective interaction can be used to perform quantum logic. In particular we produce schemes to realize cnot gates not only for two-qubit but also for t...
متن کاملDesigner spin pseudomolecule implemented with trapped ions in a magnetic gradient.
We report on the experimental investigation of an individual pseudomolecule using trapped ions with adjustable magnetically induced J-type coupling between spin states. Resonances of individual spins are well separated and are addressed with high fidelity. Quantum gates are carried out using microwave radiation in the presence of thermal excitation of the pseudomolecule's vibrations. Demonstrat...
متن کاملQuantum manipulation of trapped ions in two dimensional coulomb crystals.
We show that a large number of ions forming a 2D Coulomb crystal provides an almost ideal system for scalable quantum computation and quantum simulation. In particular, the coupling of the internal states to the motion of the ions transverse to the crystal plane allows one to implement two-qubit quantum gates. We analyze in detail the decoherence induced by anharmonic couplings, and show that v...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 87 12 شماره
صفحات -
تاریخ انتشار 2001