TY  - JOUR
A1  - Charron, Eric
A1  - Cirone, M. A.
A1  - Negretti, Antonio
A1  - Schmiedmayer, Jörg
A1  - Calarco, Tommaso
T1  - Theoretical analysis of a realistic atom-chip quantum gate
N2  - We present a detailed, realistic analysis of the implementation of a proposal for a quantum phase gate based on atomic vibrational states, specializing it to neutral rubidium atoms on atom chips. We show how to create a double-well potential with static currents on the atom chips, using for all relevant parameters values that are achieved with present technology. The potential barrier between the two wells can be modified by varying the currents in order to realize a quantum phase gate for qubit states encoded in the atomic external degree of freedom. The gate performance is analyzed through numerical simulations; the operation time is similar to 10 ms with a performance fidelity above 99.9%. For storage of the state between the operations the qubit state can be transferred efficiently via Raman transitions to two hyperfine states, where its decoherence is strongly inhibited. In addition we discuss the limits imposed by the proximity of the surface to the gate fidelity.
Y1  - 2006
UR  - http://pra.aps.org/
SN  - 1050-2947
ER  - 
TY  - JOUR
A1  - Negretti, Antonio
A1  - Calarco, T.
A1  - Cirone, M. A.
A1  - Recati, A.
T1  - Performance of quantum phase gates with cold trapped atoms
N2  - We examine the performance of a quantum phase gate implemented with cold neutral atoms in microtraps, when anharmonic traps are employed and the effects of finite temperature are also taken into account. Both the anharmonicity and the temperature are found to pose limitations to the performance of the quantum gate. We present a quantitative analysis of the problem and show that the phase gate has a high quality performance for the experimental values that are presently or in the near future achievable in the laboratory
Y1  - 2005
ER  - 
TY  - JOUR
A1  - Rzazewski, Kazimierz
A1  - Goral, K.
A1  - Cirone, M. A.
A1  - Wilkens, Martin
T1  - Bose-Einstein Condensation of two interacting particles
N2  - We investigate the notion of Bose-Einstein condensation of interacting particles. The definition of the condensate is based on the existence of the dominant eigenvalue of the single-particle density matrix. The statistical properies and the characteristics temperature are computed exactly in the soluble models of two interacting atoms.
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Cirone, M. A.
A1  - Negretti, Antonio
A1  - Calarco, T.
A1  - Krüger, P.
A1  - Schmiedmayer, Jörg
T1  - A simple quantum gate with atom chips
N2  - We present a simple scheme for implementing an atomic phase gate using two degrees of freedom for each atom and discuss its realization with cold rubidium atoms on atom chips. We investigate the performance of this collisional phase gate and show that gate operations with high fidelity can be realized in magnetic traps that are currently available on atom chips
Y1  - 2005
ER  -