Coherent Temporal Oscillations of Macroscopic Quantum States in a Josephson Junction

We report the generation and observation of coherent temporal oscillations between the macroscopic quantum states of a Josephson tunnel junction by applying microwaves with frequencies close to the level separation. Coherent temporal oscillations of excited state populations were observed by monitoring the junction's tunneling probability as a function of time. From the data, the lower limit of phase decoherence time was estimated to be about 5 microseconds.

[1]  I. Rabi.  Space Quantization in a Gyrating Magnetic Field , 1937 .

[2]  Anthony J Leggett,et al.  Influence of Dissipation on Quantum Tunneling in Macroscopic Systems , 1981 .

[3]  R. Voss,et al.  Macroscopic Quantum Tunneling in 1-μm Nb Josephson Junctions , 1981 .

[4]  I. F. Quercia.  Physics and applications of the Josephson effect , 1984 .

[5]  R. Voss,et al.  Effects of dissipation and temperature on macroscopic quantum tunneling. , 1985 .

[6]  Clarke,et al.  Energy-level quantization in the zero-voltage state of a current-biased Josephson junction. , 1985, Physical review letters.

[7]  Garg,et al.  Quantum mechanics versus macroscopic realism: Is the flux there when nobody looks? , 1985, Physical review letters.

[8]  Clarke,et al.  Measurements of macroscopic quantum tunneling out of the zero-voltage state of a current-biased Josephson junction. , 1985, Physical review letters.

[9]  Schwartz,et al.  Quantitative study of the effect of the environment on macroscopic quantum tunneling. , 1985, Physical review letters.

[10]  A. Cleland,et al.  Quantum Mechanics of a Macroscopic Variable: The Phase Difference of a Josephson Junction , 1988, Science.

[11]  Lukens,et al.  Observation of incoherent relaxation by tunneling in a macroscopic two-state system. , 1991, Physical review letters.

[12]  A. Leggett,et al.  Quantum tunnelling in condensed media , 1992 .

[13]  S Lloyd,et al.  A Potentially Realizable Quantum Computer , 1993, Science.

[14]  Han,et al.  Observation of Resonant Tunneling between Macroscopically Distinct Quantum Levels. , 1995, Physical review letters.

[15]  Stafford,et al.  Resonant photon-assisted tunneling through a double quantum dot: An electron pump from spatial Rabi oscillations. , 1996, Physical review letters.

[16]  Lukens,et al.  Generation of a population inversion between quantum states of a macroscopic variable. , 1996, Physical review letters.

[17]  Paolo Silvestrini,et al.  OBSERVATION OF ENERGY LEVELS QUANTIZATION IN UNDERDAMPED JOSEPHSON JUNCTIONS ABOVE THE CLASSICAL-QUANTUM REGIME CROSSOVER TEMPERATURE , 1997 .

[18]  A.M. Herr,et al.  Prospects for quantum coherent computation using superconducting electronics , 1997, IEEE Transactions on Applied Superconductivity.

[19]  R. Blick,et al.  COMPLEX BROADBAND MILLIMETER WAVE RESPONSE OF A DOUBLE QUANTUM DOT : RABI OSCILLATIONS IN AN ARTIFICIAL MOLECULE , 1998 .

[20]  Nasser N Peyghambarian,et al.  Direct observation of excitonic rabi oscillations in semiconductors , 1999 .

[21]  Han,et al.  Observation of cascaded two-photon-induced transitions between fluxoid states of a SQUID , 2000, Physical review letters.

[22]  Vijay Patel,et al.  Quantum superposition of distinct macroscopic states , 2000, Nature.

[23]  Y. Makhlin,et al.  Quantum-state engineering with Josephson-junction devices , 2000, cond-mat/0011269.

[24]  Y. Pashkin,et al.  Rabi oscillations in a Josephson-junction charge two-level system. , 2001, Physical review letters.

[25]  L. J. Sham,et al.  Rabi oscillations of excitons in single quantum dots. , 2001, Physical review letters.

[26]  Siyuan Han,et al.  Time-Resolved Measurement of Dissipation-Induced Decoherence in a Josephson Junction , 2001, Science.