scholarly journals Comment on ‘‘Quantum noise in the parametric oscillator: From squeezed states to coherent-state superpositions’’

1990 ◽  
Vol 64 (2) ◽  
pp. 236-236 ◽  
Author(s):  
P. Kinsler ◽  
P. D. Drummond
Keyword(s):  
Coherent State ◽  
Quantum Noise ◽  
Parametric Oscillator ◽  
Squeezed States

scholarly journals Scattering-lens based quantum imaging beyond shot noise

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dong Li ◽  
Yao Yao
Keyword(s):  
Coherent State ◽  
Shot Noise ◽  
Quantum Noise ◽  
Signal To Noise Ratio ◽  
Optical Diffraction ◽  
Squeezed States ◽  
Squeezed State ◽  
Signal To Noise ◽  
Alternative Scheme ◽  
Noise Ratio

AbstractThe scheme of optical imaging using scattering lens can provide a resolution beyond the classical optical diffraction limit with a coherent-state input. Nevertheless, due to the shot noise of the coherent state, the corresponding signal-to-noise ratio and resolution are both still shot-noise-limited. In order to circumvent this problem, we theoretically propose an alternative scheme where the squeezed state (with a sub-shot noise) is considered as input and the quantum noise is then suppressed below the shot-noise level. Consequently, when comparing with the previous imaging scheme (using combination of coherent state and scattering lens), our proposal is able to achieve an enhanced signal-to-noise ratio for a given scattering lens. Meanwhile, it is demonstrated that the resolution is also improved. We believe that this method may afford a new way of using squeezed states and enable a higher performance than that of using coherent state and scattering lens.

Quantum noise of modulation and squeezed states

1986 ◽  
Vol 119 (2) ◽  
pp. 51-54 ◽  
Author(s):  
Y. Ben-Aryeh
Keyword(s):  
Quantum Noise ◽  
Squeezed States

INTERACTION OF MESOSCOPIC JOSEPHSON JUNCTION WITH A SUCCESSIVE SQUEEZED COHERENT FIELD

2000 ◽  
Vol 14 (16) ◽  
pp. 609-618
Author(s):  
V. A. POPESCU
Keyword(s):  
Coherent State ◽  
Josephson Junction ◽  
Coherent States ◽  
Quantum Noise ◽  
Shapiro Steps ◽  
Superconducting Ring ◽  
Coherent Field ◽  
Current Voltage ◽  
Quantum Current ◽  
The Difference

Signal-to-quantum noise ratio for quantum current in mesoscopic Josephson junction of a circular superconducting ring can be improved if the electromagnetic field is in a successive squeezed coherent state. The mesoscopic Josephson junctions can feel the difference between the successive squeezed coherent states and other types of squeezed coherent states because their current–voltage Shapiro steps are different. We compare our method with another procedure for superposition of two squeezed coherent states (a squeezed even coherent state) and consider the effect of different large inductances on the supercurrent.

Multimode squeezed states produced by a confocal parametric oscillator

2003 ◽  
Vol 22 (3) ◽  
pp. 501-512 ◽  
Author(s):  
K.I. Petsas ◽  
A. Gatti ◽  
L.A. Lugiato ◽  
C. Fabre
Keyword(s):  
Parametric Oscillator ◽  
Squeezed States

Berry phase for the SU(1,1) coherent state

1988 ◽  
Vol 66 (11) ◽  
pp. 978-980 ◽  
Author(s):  
Fan Hong-Yi ◽  
H. R. Zaidi
Keyword(s):  
Coherent State ◽  
General Expression ◽  
Berry Phase ◽  
Squeezed States

We derive a general expression for the Berry phase for the case of the SU(1,1) coherent state. The results are also applicable to one- and two-mode squeezed states.

Sign in / Sign up

Export Citation Format

Share Document