Bose-Einstein condensates relative phase measurements through atomic homodyne detection

The Rabi regime for a Bose-Einstein condensate (BEC) in double-well potential occurring for sufficiently strong cross-collision strengths is analyzed. It is shown that in this regime the potential barrier acts as a temporal atomic beam splitter. An ideal 50:50 atomic beam splitter reached at specific intervals of time is employed for a balanced homodyne detection of the condensate relative phase.

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Measurements of Relative Phase in Two-Component Bose-Einstein Condensates [Phys. Rev. Lett. 81, 1543 (1998)]

Physical Review Letters ◽

10.1103/physrevlett.81.4532 ◽

1998 ◽

Vol 81 (20) ◽

pp. 4532-4532 ◽

Cited By ~ 8

Author(s):

D. S. Hall ◽

M. R. Matthews ◽

C. E. Wieman ◽

E. A. Cornell

Keyword(s):

Relative Phase ◽

Two Component ◽

Bose Einstein

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Effects of relative phase and interactions on atom-laser outcoupling from a double-well Bose–Einstein condensate: Markovian and non-Markovian dynamics

Journal of Physics B Atomic Molecular and Optical Physics ◽

10.1088/0953-4075/41/2/025301 ◽

2008 ◽

Vol 41 (2) ◽

pp. 025301 ◽

Cited By ~ 8

Author(s):

G M Nikolopoulos ◽

C Lazarou ◽

P Lambropoulos

Keyword(s):

Relative Phase ◽

Einstein Condensate ◽

Atom Laser ◽

Bose Einstein Condensate ◽

Markovian Dynamics ◽

Bose Einstein

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TOWARD A FULL RECONSTRUCTION OF DENSITY MATRIX BY ON/OFF MEASUREMENTS

International Journal of Quantum Information ◽

10.1142/s0219749909004888 ◽

2009 ◽

Vol 07 (supp01) ◽

pp. 27-32 ◽

Cited By ~ 2

Author(s):

G. BRIDA ◽

M. GENOVESE ◽

M. GRAMEGNA ◽

P. TRAINA ◽

E. PREDAZZI ◽

...

Keyword(s):

Quantum Mechanics ◽

Quantum Information ◽

Density Matrix ◽

Foundations Of Quantum Mechanics ◽

Quantum Tomography ◽

Local Oscillator ◽

Homodyne Detection ◽

Short Pulses ◽

Phase Measurements ◽

Full Reconstruction

The knowledge of density matrix is fundamental for several applications, ranging from quantum information to the foundations of quantum mechanics and quantum optics. Nevertheless, quantum tomography based on homodyne detection is a rather complicated technique when applied to short pulses in photocounting regime. In this paper, we present an experimental work addressed to test an innovative scheme for a full reconstruction of the density matrix by using on/off detection coupled to phase measurements respect to a local oscillator.

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NONLINEAR TUNNELING INDUCED DYNAMIC-EFFECT OF BOSE–EINSTEIN CONDENSATES IN AN EXTENDED JOSEPHSON-JUNCTION MODEL

Modern Physics Letters B ◽

10.1142/s0217984911027340 ◽

2011 ◽

Vol 25 (27) ◽

pp. 2137-2148 ◽

Cited By ~ 2

Author(s):

J.-L. LIU ◽

J.-Q. LIANG

Keyword(s):

Josephson Junction ◽

Relative Phase ◽

Dynamic Properties ◽

Dynamic Effect ◽

Atom Pair ◽

System Parameters ◽

Pair Tunneling ◽

Interaction Regime ◽

Cat States ◽

Bose Einstein

In this paper, we investigated theoretically the dynamic effect induced by nonlinear tunneling of two weakly linked Bose–Einstein condensates in an extended boson Josephson-junction model, in which the two-body interaction is extended to neighboring lattice sites in strong interaction regime. As a consequence the dynamic properties compared with the usual Josephson-junction model are crucially modified by the atom-pair tunneling, which leads to the macroscopic quantum-states of coherent relative-phase between two condensates seen to be effective Schrödinger cat states. The relative-phase is controllable by system parameters and thus can be used to realize the qubit in quantum computation.

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