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000185582 0247_ $$2doi$$a10.1103/PhysRevLett.113.247001
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000185582 1001_ $$0P:(DE-HGF)0$$aVool, U.$$b0$$eCorresponding Author
000185582 245__ $$aNon-Poissonian Quantum Jumps of a Fluxonium Qubit due to Quasiparticle Excitations
000185582 260__ $$aCollege Park, Md.$$bAPS$$c2014
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000185582 520__ $$aAs the energy relaxation time of superconducting qubits steadily improves, nonequilibrium quasiparticle excitations above the superconducting gap emerge as an increasingly relevant limit for qubit coherence. We measure fluctuations in the number of quasiparticle excitations by continuously monitoring the spontaneous quantum jumps between the states of a fluxonium qubit, in conditions where relaxation is dominated by quasiparticle loss. Resolution on the scale of a single quasiparticle is obtained by performing quantum nondemolition projective measurements within a time interval much shorter than T1, using a quantum-limited amplifier (Josephson parametric converter). The quantum jump statistics switches between the expected Poisson distribution and a non-Poissonian one, indicating large relative fluctuations in the quasiparticle population, on time scales varying from seconds to hours. This dynamics can be modified controllably by injecting quasiparticles or by seeding quasiparticle-trapping vortices by cooling down in a magnetic field.
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000185582 7001_ $$0P:(DE-HGF)0$$aPop, I. M.$$b1
000185582 7001_ $$0P:(DE-HGF)0$$aSliwa, K.$$b2
000185582 7001_ $$0P:(DE-HGF)0$$aAbdo, B.$$b3
000185582 7001_ $$0P:(DE-HGF)0$$aWang, C.$$b4
000185582 7001_ $$0P:(DE-HGF)0$$aBrecht, T.$$b5
000185582 7001_ $$0P:(DE-HGF)0$$aGao, Y. Y.$$b6
000185582 7001_ $$0P:(DE-HGF)0$$aShankar, S.$$b7
000185582 7001_ $$0P:(DE-HGF)0$$aHatridge, M.$$b8
000185582 7001_ $$0P:(DE-Juel1)151130$$aCatelani, G.$$b9$$ufzj
000185582 7001_ $$0P:(DE-HGF)0$$aMirrahimi, M.$$b10
000185582 7001_ $$0P:(DE-HGF)0$$aFrunzio, L.$$b11
000185582 7001_ $$0P:(DE-HGF)0$$aSchoelkopf, R. J.$$b12
000185582 7001_ $$0P:(DE-HGF)0$$aGlazman, L. I.$$b13
000185582 7001_ $$0P:(DE-HGF)0$$aDevoret, M. H.$$b14
000185582 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.113.247001$$gVol. 113, no. 24, p. 247001$$n24$$p247001$$tPhysical review letters$$v113$$x1079-7114$$y2014
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