Quantum memory via slow and stopped light

1. Quantum memory via slow and stopped light �Observation of Ultraslow and Stopped Light Pulses in a Solid ,� A.V. Turukhin, V.S. Sudarshanam, M. S. Shahriar, J. A. Musser, B.S. Ham, and P.R. Hemmer, Physical Review Letters 8802, p. 3602 (2002), preprint in: quant-ph/0010009; �Dark state polaritons in electromagnetically induced transparency,� Fleischhauer, Lukin, Phys. Rev. Lett. 84, p 5094 (2000)

6. EIT FOR SLOW LIGHT AND STORAGE COUPLING LASER PUNCHES HOLE IN ABSORPTION PROBE SEES TRANSARENCY

11. DARK-RESONANCE ADIABATIC PASSAGE (ELECTROMAG. INDUCED TRANSPARENCY IN OPTICALLY DENSE MEDIA) �COUNTER-INTUITIVE� PULSE SEQUENCE COUPLING LASER PUNCHES HOLE IN ABSORPTION PROBE SEES TRANSARENCY WEAK PROBE COHERENTLY �ABSORBED� -- CAN BE RECOVERED

15. Figure 3. Light acceleration, deceleration and stopping demonstrations. Experimental conditions similar to those in Figure 2(d). (a)�Dashed data is accelerated slow light produced by increasing the coupling intensity after the probe pulse has entered the crystal. Unaccelerated slow light is solid curve. Dotted curve is intermediate case. Upper dashed curve is slow light when the coupling beam intensity is high at all times. Probe pulse duration: 50 msec. Intensities are strong coupling: 535�W/cm2, weak coupling: 77�W/cm2, probe: 11�W/cm2, auxiliary: 60�W/cm2. (b) Solid and dashed data is decelerated slow light produced by decreasing the coupling intensity, to the percentages indicated, after the probe pulse has entered the crystal. Dotted curve is undecelerated slow light. Input probe pulse duration: 3 msec. Intensities are strong coupling: 543�W/cm2, probe: 373�W/cm2, auxiliary: 95�W/cm2. (c) Stopped light demonstration. Dashed curve is original slow light, solid curve is recovered stopped light. Center pulse is for rephasing. Sharp spike when coupling is restored is fast-light Raman spin echo of transient produced when coupling is first turned-off. The recovered signals decrease in amplitude with increased storage time (not shown) as expected for the 500�msec spin homogeneous lifetime. Input probe pulse duration: 50 msec, rephrasing pulse (coupling and strong probe): 7 msec. Intensities are coupling: 77�W/cm2, probe: 11�W/cm2, auxiliary: 60�W/cm2. For rephrasing pulse, intensities are coupling: 535�W/cm2, probe: 430�W/cm2. (d) Acceleration of recovered stopped light. Description similar to part (a). Input probe pulse duration: 50 msec, rephrasing pulse: 3 msec. Intensities are coupling: 90�W/cm2, probe: 17�W/cm2, auxiliary: 79�W/cm2. For rephrasing pulse, coupling: 900�W/cm2, probe: 620�W/cm2. (a) Probe pulse 50 microsec. C2 =2140 W/cm2, C = 306 W/cm2, R =480, P =22, beam diam 50 micron. Angle 20 mrad. Excited state 5/2. Weak coupling beam signal: delay =60 microsec, width =40, height =1. Strong coupling signal: delay =23, width =30, height =2. Accelerated signal: width =11, height =3.2. (b) Probe pulse 3 microsec. C2 =2170 W/cm2, R =380, P =1490, beam diam 50 micron. Angle 20 mrad. Excited state 5/2. Fastest: C =2170, delay =15 microsec, width =12.5, height = 1, Fast: C =1170, delay =21, width =21, height =0.75 , Slow: C =609, delay =35, width =36, height =0.34, Slowest: C =217, delay =36, width =48, height =0.27. (c) Probe pulse 50 microsec. C2 =2140 W/cm2, C = 306 W/cm2, R =475, P =44, P2 =1730. Rephasing pulse 7 microsec, beam diam 50 micron. Angle 20 mrad. Excited state 5/2. (d) Input probe pulse 50 microsec. C =359 W/cm2, C2 =3590, R =314, P =68, P2 =2470, beam diam 50 micron. Angle 20 mrad. Excited state 5/2. Accelerated: width =4.35 microsec, height = 7.6, Slow: width =30, height =1. Date: 7-6-01 Freq: C = 76.995, P=87.19, R=109 (109.09=5/2 state) Power (laser = 200 mW, no attenuators): C2=63, C=9 (4 volts control), R=14, P2=51, P=1.3 Attenuators: P=0, R=0 Spot size = 50 micron, Angle = 20 mrad Crystal length = 3 mm, Temp = 5 K Pulse lengths (50Hz): R=10ms? off 0.8ms before C, C: first=0.2ms before P, second=6ms after interaction P: first=0ms, wait 120 C2=110 ms, 8 volts Date: 7-20-01 Freq: C = 77, P=87.19, R=109 (109.09=5/2 state) Power (laser = 330 mW, no attenuators): C2=32%, C=10% of C2 (4 volts control), R=5.6%, P2=22%, P=0.61% Attenuators: P=0, R=0.3 Spot size = 50 micron, Angle = 20 mrad Crystal length = 3 mm, Temp = 5 K Pulse lengths (50Hz): R=10ms off 0.6ms before C, C: on=0.3ms before P, off=9ms after interaction Figure 3. Light acceleration, deceleration and stopping demonstrations. Experimental conditions similar to those in Figure 2(d). (a)�Dashed data is accelerated slow light produced by increasing the coupling intensity after the probe pulse has entered the crystal. Unaccelerated slow light is solid curve. Dotted curve is intermediate case. Upper dashed curve is slow light when the coupling beam intensity is high at all times. Probe pulse duration: 50 msec. Intensities are strong coupling: 535�W/cm2, weak coupling: 77�W/cm2, probe: 11�W/cm2, auxiliary: 60�W/cm2. (b) Solid and dashed data is decelerated slow light produced by decreasing the coupling intensity, to the percentages indicated, after the probe pulse has entered the crystal. Dotted curve is undecelerated slow light. Input probe pulse duration: 3 msec. Intensities are strong coupling: 543�W/cm2, probe: 373�W/cm2, auxiliary: 95�W/cm2. (c) Stopped light demonstration. Dashed curve is original slow light, solid curve is recovered stopped light. Center pulse is for rephasing. Sharp spike when coupling is restored is fast-light Raman spin echo of transient produced when coupling is first turned-off. The recovered signals decrease in amplitude with increased storage time (not shown) as expected for the 500�msec spin homogeneous lifetime. Input probe pulse duration: 50 msec, rephrasing pulse (coupling and strong probe): 7 msec. Intensities are coupling: 77�W/cm2, probe: 11�W/cm2, auxiliary: 60�W/cm2. For rephrasing pulse, intensities are coupling: 535�W/cm2, probe: 430�W/cm2. (d) Acceleration of recovered stopped light. Description similar to part (a). Input probe pulse duration: 50 msec, rephrasing pulse: 3 msec. Intensities are coupling: 90�W/cm2, probe: 17�W/cm2, auxiliary: 79�W/cm2. For rephrasing pulse, coupling: 900�W/cm2, probe: 620�W/cm2. (a) Probe pulse 50 microsec. C2 =2140 W/cm2, C = 306 W/cm2, R =480, P =22, beam diam 50 micron. Angle 20 mrad. Excited state 5/2. Weak coupling beam signal: delay =60 microsec, width =40, height =1. Strong coupling signal: delay =23, width =30, height =2. Accelerated signal: width =11, height =3.2. (b) Probe pulse 3 microsec. C2 =2170 W/cm2, R =380, P =1490, beam diam 50 micron. Angle 20 mrad. Excited state 5/2. Fastest: C =2170, delay =15 microsec, width =12.5, height = 1, Fast: C =1170, delay =21, width =21, height =0.75 , Slow: C =609, delay =35, width =36, height =0.34, Slowest: C =217, delay =36, width =48, height =0.27. (c) Probe pulse 50 microsec. C2 =2140 W/cm2, C = 306 W/cm2, R =475, P =44, P2 =1730. Rephasing pulse 7 microsec, beam diam 50 micron. Angle 20 mrad. Excited state 5/2. (d) Input probe pulse 50 microsec. C =359 W/cm2, C2 =3590, R =314, P =68, P2 =2470, beam diam 50 micron. Angle 20 mrad. Excited state 5/2. Accelerated: width =4.35 microsec, height = 7.6, Slow: width =30, height =1. Date: 7-6-01 Freq: C = 76.995, P=87.19, R=109 (109.09=5/2 state) Power (laser = 200 mW, no attenuators): C2=63, C=9 (4 volts control), R=14, P2=51, P=1.3 Attenuators: P=0, R=0 Spot size = 50 micron, Angle = 20 mrad Crystal length = 3 mm, Temp = 5 K Pulse lengths (50Hz): R=10ms? off 0.8ms before C, C: first=0.2ms before P, second=6ms after interaction P: first=0ms, wait 120 C2=110 ms, 8 volts Date: 7-20-01 Freq: C = 77, P=87.19, R=109 (109.09=5/2 state) Power (laser = 330 mW, no attenuators): C2=32%, C=10% of C2 (4 volts control), R=5.6%, P2=22%, P=0.61% Attenuators: P=0, R=0.3 Spot size = 50 micron, Angle = 20 mrad Crystal length = 3 mm, Temp = 5 K Pulse lengths (50Hz): R=10ms off 0.6ms before C, C: on=0.3ms before P, off=9ms after interaction