Learn More
Methods for, and limitations to, the generation of entangled states of trapped atomic ions are examined. As much as possible, state manipulations are described in terms of quantum logic operations since the conditional dynamics implicit in quantum logic is central to the creation of entanglement. Keeping with current interest, some experimental issues in(More)
We have investigated motional heating of laser-cooled Be ions held in radio-frequency ~Paul! traps. We have measured heating rates in a variety of traps with different geometries, electrode materials, and characteristic sizes. The results show that heating is due to electric-field noise from the trap electrodes that exerts a stochastic fluctuating force on(More)
We demonstrate the operation of a two-bit "controlled-NOT" quantum logic gate, which, in conjunction with simple single-bit operations, forms a universal quantum logic gate for quantum computation. The two quantum bits are stored in the internal and external degrees of freedom of a single trapped atom, which is first laser cooled to the zero-point energy.(More)
We report the creation of thermal, Fock, coherent, and squeezed states of motion of a harmonically bound 9 Be + ion. The last three states are coherently prepared from an ion which has been initially laser-cooled to the zero-point of motion. The ion is trapped in the regime where the coupling between its motional and internal states, due to applied(More)
A "Schrödinger cat"-like state of matter has been generated at the single atom level. A trapped Be ion was laser-cooled to the zero-point energy and then prepared in a superposition of 9 + spatially separated coherent harmonic oscillator states. We create this state by applying a sequence of laser pulses, which entangle internal (electronic) and external(More)
B. E. King,* C. S. Wood, C. J. Myatt, Q. A. Turchette, D. Leibfried, W. M. Itano, C. Monroe, and D. J. Wineland Time and Frequency Division, National Institute of Standards and Technology, Boulder, Colorado 80303 (Received 6 March 1998) We report preparation in the ground state of collective modes of motion of two trapped 9Be1 ions. This is a crucial step(More)
We present results from an experimental study of the decoherence and decay of quantum states of a trapped atomic ion’s harmonic motion interacting with several types of engineered reservoirs. We experimentally simulate three types of reservoirs: a high-temperature amplitude reservoir, a zero-temperature amplitude reservoir, and a high-temperature phase(More)
Although the task seems trivial for human listeners, research in automating source separation still lags far behind human performance and is especially difficult for single-channel signals. One of the latest and most promising methods of single-channel source separation is non-negative matrix factorization, which works by synthesizing signals from a learned(More)