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Search Results: 1 - 10 of 200718 matches for " P. Tombesi "
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Heating and decoherence suppression using decoupling techniques
D. Vitali,P. Tombesi
Physics , 2001, DOI: 10.1103/PhysRevA.65.012305
Abstract: We study the application of decoupling techniques to the case of a damped vibrational mode of a chain of trapped ions, which can be used as a quantum bus in linear ion trap quantum computers. We show that vibrational heating could be efficiently suppressed using appropriate ``parity kicks''. We also show that vibrational decoherence can be suppressed by this decoupling procedure, even though this is generally more difficult because the rate at which the parity kicks have to applied increases with the effective bath temperature.
Quantum spin models with electrons in Penning traps
G. Ciaramicoli,I. Marzoli,P. Tombesi
Physics , 2008, DOI: 10.1103/PhysRevA.78.012338
Abstract: We propose a scheme to engineer an effective spin Hamiltonian starting from a system of electrons confined in micro-Penning traps. By means of appropriate sequences of electromagnetic pulses, alternated to periods of free evolution, we control the shape and strength of the spin-spin interaction. Moreover, we can modify the effective magnetic field experienced by the particle spin. This procedure enables us to reproduce notable quantum spin systems, such as Ising and XY models. Thanks to its scalability, our scheme can be applied to a fairly large number of trapped particles within the reach of near future technology.
Emergence of atom-light-mirror entanglement inside an optical cavity
C. Genes,D. Vitali,P. Tombesi
Physics , 2008, DOI: 10.1103/PhysRevA.77.050307
Abstract: We propose a scheme for the realization of a hybrid, strongly quantum-correlated system formed of an atomic ensemble surrounded by a high-finesse optical cavity with a vibrating mirror. We show that the steady state of the system shows tripartite and bipartite continuous variable entanglement in experimentally accessible parameter regimes, which is robust against temperature.
From a single- to a double-well Penning trap
G. Ciaramicoli,I. Marzoli,P. Tombesi
Physics , 2010, DOI: 10.1103/PhysRevA.82.044302
Abstract: The new generation of planar Penning traps promises to be a flexible and versatile tool for quantum information studies. Here, we propose a fully controllable and reversible way to change the typical trapping harmonic potential into a double-well potential, in the axial direction. In this configuration a trapped particle can perform coherent oscillations between the two wells. The tunneling rate, which depends on the barrier height and width, can be adjusted at will by varying the potential difference applied to the trap electrodes. Most notably, tunneling rates in the range of kHz are achievable even with a trap size of the order of 100 microns.
Quantum-Non-Demolition Endoscopic Tomography
Mauro Fortunato,Paolo Tombesi,Wolfgang P. Schleich
Physics , 1998,
Abstract: We present a new indirect method to measure the quantum state of a single mode of the electromagnetic field in a cavity. Our proposal combines the idea of (endoscopic) probing and that of tomography in the sense that the signal field is coupled via a quantum-non-demolition Hamiltonian to a meter field on which then quantum state tomography is performed using balanced homodyne detection. This technique provides full information about the signal state. We also discuss the influence of the measurement of the meter on the signal field.
Endoscopic Tomography and Quantum-Non-Demolition
Mauro Fortunato,Paolo Tombesi,Wolfgang P. Schleich
Physics , 1998, DOI: 10.1103/PhysRevA.59.718
Abstract: We propose to measure the quantum state of a single mode of the radiation field in a cavity---the signal field---by coupling it via a quantum-non-demolition Hamiltonian to a meter field in a highly squeezed state. We show that quantum state tomography on the meter field using balanced homodyne detection provides full information about the signal state. We discuss the influence of measurement of the meter on the signal field.
Quantum Logic with a Single Trapped Electron
S. Mancini,A. M. Martins,P. Tombesi
Physics , 1999, DOI: 10.1103/PhysRevA.61.012303
Abstract: We propose the use of a trapped electron to implement quantum logic operations. The fundamental controlled-NOT gate is shown to be feasible. The two quantum bits are stored in the internal and external (motional) degrees of freedom.
Radiation Pressure Induced Einstein-Podolsky-Rosen Paradox
V. Giovannetti,S. Mancini,P. Tombesi
Physics , 2000, DOI: 10.1209/epl/i2001-00284-x
Abstract: We demonstrate the appearance of Einstein-Podolsky-Rosen (EPR) paradox when a radiation field impinges on a movable mirror. The, the possibility of a local realism test within a pendular Fabry-Perot cavity is shown to be feasible.
Entangling two distant non-interacting microwave modes
M. Abdi,P. Tombesi,D. Vitali
Physics , 2014, DOI: 10.1002/andp.201400100
Abstract: We propose a protocol able to prepare two remote and initially uncorrelated microwave modes in an entangled stationary state, which is certifiable using only local optical homodyne measurements. The protocol is an extension of continuous variable entanglement swapping, and exploits two hybrid quadripartite opto-electro-mechanical systems in which a nanomechanical resonator acts as a quantum interface able to entangle optical and microwave fields. The proposed protocol allows to circumvent the problems associated with the fragility of microwave photons with respect to thermal noise and may represent a fundamental tool for the realization of quantum networks connecting distant solid-state and superconducting qubits, which are typically manipulated with microwave fields. The certifying measurements on the optical modes guarantee the success of entanglement swapping without the need of performing explicit measurements on the distant microwave fields.
Spin chains with electrons in Penning traps
G. Ciaramicoli,I. Marzoli,P. Tombesi
Physics , 2007,
Abstract: We demonstrate that spin chains are experimentally feasible using electrons confined in micro-Penning traps, supplemented with local magnetic field gradients. The resulting Heisenberg-like system is characterized by coupling strengths showing a dipolar decay. These spin chains can be used as a channel for short distance quantum communication. Our scheme offers high accuracy in reproducing an effective spin chain with relatively large transmission rate.
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