INTERACTIONS BETWEEN SUPERCONDUCTING QUBITS MEDIATED BY TRAVELLING - PowerPoint PPT Presentation

INTERACTIONS BETWEEN SUPERCONDUCTING QUBITS MEDIATED BY TRAVELLING PHOTONS Kevin Lalumière 1 , B. C. Sanders 2 , A. F. van Loo 3 , A. Fedorov 3 , A. Wallraff 3 , and A. Blais 1 Phys. Rev. A 88 , 043806 Science, in press 1 Université de Sherbrooke, Canada 2 University of Calgary, Canada 3 University of Zurich, Switzerland

PLAN

PLAN What I do

PLAN What I do Physics primer: EM waves and electrical circuits

PLAN What I do Physics primer: EM waves and electrical circuits Waveguide QED

PLAN What I do Physics primer: EM waves and electrical circuits Waveguide QED Many qubits waveguide QED (our contribution)

WHAT I DO

WHAT I DO

WHAT I DO

PHYSICS PRIMER: ELECTRICAL CURRENT AND EM WAVES

PHYSICS PRIMER: ELECTRICAL CURRENT AND EM WAVES

PHYSICS PRIMER: ELECTRICAL CURRENT AND EM WAVES

PHYSICS PRIMER: ELECTRICAL CURRENT AND EM WAVES

PHYSICS PRIMER: ELECTRICAL CIRCUITS

PHYSICS PRIMER: ELECTRICAL CIRCUITS Circuits element schematics

PHYSICS PRIMER: ELECTRICAL CIRCUITS Circuits element schematics Wire

PHYSICS PRIMER: ELECTRICAL CIRCUITS Circuits element schematics Wire Ground

PHYSICS PRIMER: ELECTRICAL CIRCUITS Circuits element schematics Wire Ground Capacitor

PHYSICS PRIMER: ELECTRICAL CIRCUITS Circuits element schematics Wire Ground Capacitor Voltage source

PHYSICS PRIMER: ELECTRICAL CIRCUITS Circuits element schematics Wire Ground Capacitor Voltage source Oscilloscope (to measure)

PHYSICS PRIMER: ELECTRICAL CIRCUITS Circuits element schematics Wire Ground Capacitor Voltage source Oscilloscope (to measure) Josephson junction

PHYSICS PRIMER: ELECTRICAL CIRCUITS Circuits element schematics Wire Ground Capacitor Voltage source Oscilloscope (to measure) Josephson junction

PHYSICS PRIMER: ELECTRICAL CIRCUITS Circuits element schematics Wire Ground Capacitor Voltage source Oscilloscope (to measure) Josephson junction

WAVEGUIDE QED EXPERIMENT

WAVEGUIDE QED EXPERIMENT

WAVEGUIDE QED EXPERIMENT -273˚C

WAVEGUIDE QED EXPERIMENT -273˚C

WAVEGUIDE QED EXPERIMENT -273˚C

WAVEGUIDE QED EXPERIMENT -273˚C

WAVEGUIDE QED EXPERIMENT -273˚C

WAVEGUIDE QED EXPERIMENT -273˚C

WAVEGUIDE QED EXPERIMENT -273˚C

WAVEGUIDE QED EXPERIMENT -273˚C

WAVEGUIDE QED EXPERIMENT -273˚C

WAVEGUIDE QED LOW INTENSITY V in ( t )

WAVEGUIDE QED LOW INTENSITY V in ( t ) 1.0 0.8 0.6 0.4 0.2 0.0 - 10 - 5 0 5 10

WAVEGUIDE QED LOW INTENSITY V in ( t ) 1.0 0.8 0.6 0.4 0.2 0.0 - 10 - 5 0 5 10

WAVEGUIDE QED HIGH INTENSITY V in ( t )

WAVEGUIDE QED HIGH INTENSITY V in ( t ) 1.0 0.8 0.6 0.4 0.2 - 10 - 5 0 5 10

WAVEGUIDE QED HIGH INTENSITY V in ( t ) 1.0 0.8 0.6 0.4 0.2 - 10 - 5 0 5 10

WAVEGUIDE QED HIGH INTENSITY V in ( t ) 1.0 0.8 0.6 0.4 0.2 - 10 - 5 0 5 10

WAVEGUIDE QED HIGH INTENSITY V in ( t ) 1.0 0.8 0.6 0.4 0.2 - 10 - 5 0 5 10

WAVEGUIDE QED HIGH INTENSITY V in ( t ) 1.0 0.8 0.6 0.4 0.2 - 10 - 5 0 5 10

WAVEGUIDE QED HIGH INTENSITY V in ( t ) 1.0 0.8 0.6 0.4 0.2 - 10 - 5 0 5 10

WAVEGUIDE QED HIGH INTENSITY V in ( t ) 1.0 0.8 0.6 0.4 0.2 - 10 - 5 0 5 10

WAVEGUIDE QED HIGH INTENSITY V in ( t ) 1.0 0.8 0.6 0.4 0.2 - 10 - 5 0 5 10

WAVEGUIDE QED HIGH INTENSITY V in ( t ) 1.0 0.8 0.6 0.4 0.2 - 10 - 5 0 5 10

WAVEGUIDE QED HIGH INTENSITY V ( t ) O. Astafiev et al. Science 327 , 840 (2010) I.-O. Hio et al. Phys. Rev. Lett. 107 , 073601 (2011) 3 A � 0 S (10 -24 W/Hz) 2 � � 0 – � � 0 + � 1 0 -100 -50 0 50 100 �� /2 � (MHz)

WAVEGUIDE QED HIGH INTENSITY V ( t ) O. Astafiev et al. Science 327 , 840 (2010) I.-O. Hio et al. Phys. Rev. Lett. 107 , 073601 (2011) 3 A Observed experimentally � 0 S (10 -24 W/Hz) 2 � � 0 – � � 0 + � 1 0 -100 -50 0 50 100 �� /2 � (MHz)

WAVEGUIDE QED HIGH INTENSITY V ( t ) O. Astafiev et al. Science 327 , 840 (2010) I.-O. Hio et al. Phys. Rev. Lett. 107 , 073601 (2011) 3 A Observed experimentally � 0 Important experiment for physicists S (10 -24 W/Hz) 2 � � 0 – � � 0 + � 1 0 -100 -50 0 50 100 �� /2 � (MHz)

WAVEGUIDE QED HIGH INTENSITY V ( t ) O. Astafiev et al. Science 327 , 840 (2010) I.-O. Hio et al. Phys. Rev. Lett. 107 , 073601 (2011) 3 A Observed experimentally � 0 Important experiment for physicists S (10 -24 W/Hz) 2 � � 0 – � � 0 + � Usually, qubits (atoms) move 1 0 -100 -50 0 50 100 �� /2 � (MHz)

WAVEGUIDE QED HIGH INTENSITY V ( t ) O. Astafiev et al. Science 327 , 840 (2010) I.-O. Hio et al. Phys. Rev. Lett. 107 , 073601 (2011) 3 A Observed experimentally � 0 Important experiment for physicists S (10 -24 W/Hz) 2 � � 0 – � � 0 + � Usually, qubits (atoms) move 1 Hard to couple to drive signal 0 -100 -50 0 50 100 �� /2 � (MHz)

WAVEGUIDE QED HIGH INTENSITY V ( t ) O. Astafiev et al. Science 327 , 840 (2010) I.-O. Hio et al. Phys. Rev. Lett. 107 , 073601 (2011) 3 A Observed experimentally � 0 Important experiment for physicists S (10 -24 W/Hz) 2 � � 0 – � � 0 + � Usually, qubits (atoms) move 1 Hard to couple to drive signal Hard to read output signal 0 -100 -50 0 50 100 �� /2 � (MHz)

NEW WAVEGUIDE QED EXPERIMENT -273˚C

NEW WAVEGUIDE QED EXPERIMENT -273˚C

NEW WAVEGUIDE QED EXPERIMENT -273˚C

NEW WAVEGUIDE QED EXPERIMENT -273˚C

NEW WAVEGUIDE QED EXPERIMENT -273˚C Phase acquired by EM wave between qubits

φ = n π SUPER- AND SUBRADIANCE

φ = n π SUPER- AND SUBRADIANCE

φ = n π SUPER- AND SUBRADIANCE

φ = n π SUPER- AND SUBRADIANCE

φ = n π SUPER- AND SUBRADIANCE

φ = n π SUPER- AND SUBRADIANCE

φ = n π SUPER- AND SUBRADIANCE Superradiance

φ = n π SUPER- AND SUBRADIANCE Subradiance (not drive tone) Superradiance

φ = n π SUPER- AND SUBRADIANCE Subradiance (not drive tone) First observation of this signature of subradiance Superradiance

φ = n π SUPER- AND SUBRADIANCE Subradiance (not drive tone) First observation of this signature of subradiance Superradiance Decoherence free subspace?

φ =( 2 n +1) π /2 COHERENT INTERACTION

φ =( 2 n +1) π /2 COHERENT INTERACTION

φ =( 2 n +1) π /2 COHERENT INTERACTION

φ =( 2 n +1) π /2 COHERENT INTERACTION

φ =( 2 n +1) π /2 COHERENT INTERACTION Vacuum fluctuations of EM waves

φ =( 2 n +1) π /2 COHERENT INTERACTION Vacuum fluctuations of EM waves Because of symmetry, coherent interaction is 0 for φ = n π

φ =( 2 n +1) π /2 COHERENT INTERACTION Vacuum fluctuations of EM waves Because of symmetry, coherent interaction is 0 for φ = n π It is maximal around φ =( 2 n +1) π /2

φ =( 2 n +1) π /2 COHERENT INTERACTION Vacuum fluctuations of EM waves Because of symmetry, coherent interaction is 0 for φ = n π It is maximal around φ =( 2 n +1) π /2

φ =( 2 n +1) π /2 COHERENT INTERACTION Vacuum fluctuations of EM waves Because of symmetry, coherent interaction is 0 for φ = n π It is maximal around φ =( 2 n +1) π /2

φ =( 2 n +1) π /2 COHERENT INTERACTION Vacuum fluctuations of EM waves Because of symmetry, coherent interaction is 0 for φ = n π It is maximal around φ =( 2 n +1) π /2

φ =( 2 n +1) π /2 COHERENT INTERACTION

φ =( 2 n +1) π /2 COHERENT INTERACTION

φ =( 2 n +1) π /2 COHERENT INTERACTION

φ =( 2 n +1) π /2 COHERENT INTERACTION First observation of signature of exchange interaction in these kind of systems.

φ =( 2 n +1) π /2 COHERENT INTERACTION First observation of signature of exchange interaction in these kind of systems. Two qubits gate

φ =( 2 n +1) π /2 COHERENT INTERACTION First observation of signature of exchange interaction in these kind of systems. Two qubits gate Quantum interaction of objects 2 cm appart!

Phys. Rev. A 88 , 043806 Science, in press CONCLUSIONS

Phys. Rev. A 88 , 043806 Science, in press CONCLUSIONS Using cold electrical circuits and Josephson junctions

Phys. Rev. A 88 , 043806 Science, in press CONCLUSIONS Using cold electrical circuits and Josephson junctions We can build many-qubits quantum devices that exhibits interesting physical effects such as

Phys. Rev. A 88 , 043806 Science, in press CONCLUSIONS Using cold electrical circuits and Josephson junctions We can build many-qubits quantum devices that exhibits interesting physical effects such as 3 A � 0 S (10 -24 W/Hz) 2 � Mollow triplets � 0 – � � 0 + � 1 0 -100 -50 0 50 100 �� /2 � (MHz)