D-Wave D-Wave Systems Inc.
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1 D-Wave D-Wave sems Inc. Anaol Yu. mirnov D-Wave sems Inc. Vancouver Briish Columbia HE QUANUM COMPUING COMPANY M Decoherence and Noise Conrol in rongl Driven uperconducing Quanum Bis Collaboraion: M. Grajcar E. Il ichev A. Imalkov IPH Jena German M.H.. Amin A. Maassen van den Brink A. Zagoskin D-Wave sems Inc.
2 D-Wave D-Wave sems Inc. HE QUANUM COMPUING COMPANY M Ouline:. Quanum Brownian moion of a driven wo-sae ssem.. abi oscillaions and decoherence suppression in a superconducing flu qubi. 3. abi specroscop and noise manipulaion. 4. Conclusions.
3 & & & D-Wave D-Wave sems Inc. HE QUANUM COMPUING COMPANY M Qubi { } Hea bah Q Driving force FF cos Hamilonian and Heisenberg equaions: H Q F cos H Hea bah: Q F. cos Q F ϕ M i [ ] Q Q B cos [ ] Q Q χ" coh. θ. X E ± χ χ" ±. s A e / / / E E / /. c
4 D-Wave sems Inc. D-Wave sems Inc. HE QUANUM COMPUING COMPANY M Non-Markovian Heisenberg-Langevin equaions Flucuaion forces: [ ] [ ]. Q M d F Q M d F ϕ δ δ ξ ϕ δ δ ξ & & & [ ] [ ]. Q M d Q Q M d Q δ δ ξ δ δ ξ ξ ξ G.F. Efremov A.Yu. mirnov ov.phs. JEP
5 D-Wave sems Inc. D-Wave sems Inc. HE QUANUM COMPUING COMPANY M Qubi wih hea bah no driving force : / e X X X [ ] [ ] cos cos / / / / e e e e Populaion difference: Evoluion of -polariaion: eq eq X anh X X Equilibrium relaaion and dephasing raes :
6 wih he frequenc: D-Wave D-Wave sems Inc. abi oscillaions of he ecied level populaion P Ec : and he damping rae P Ec X F HE QUANUM COMPUING COMPANY M Qubi wih hea bah and driving force. Eac resonance Weak qubi-bah coupling oaing Wave Approimaion : E E Γ <<. / e cos >>. P Ec.
7 D-Wave D-Wave sems Inc. HE QUANUM COMPUING COMPANY M abi oscillaions of he dipole momen a ero bias: wih he sead-sae -polariaion: Z χ" Γ e cos / e sin sin Z Z cos χ" and he addiional decoherence rae non-ero bias: Γ. A.Yu. mirnov Phs.ev. B ; Phs.ev. B
8 D-Wave D-Wave sems Inc. HE QUANUM COMPUING COMPANY M For he srongl driven qubi >> - abi oscillaions of boh populaion and -polariaion disappear for he same relaaion ime : Wihou he driving force: eq eq : defines a imescale for relaaion of populaion : defines a dephasing rae deca of a dipole momen.
9 D-Wave D-Wave sems Inc. HE QUANUM COMPUING COMPANY M abi oscillaions in a flu superconducing qubi. Quanum aes: L lef roaing curren righ roaing curren I I q uperconducing Loop: Macroscopic wo-level ssem I. Chiorescu e al. cience ; ime domain Bias: e I q / π Φ Φ E. Il ichev e al. Phs. ev. Le Frequenc domain /
10 Measuremens: Deca ime of abi oscillaions: τ abi 5ns elaaion ime of undriven qubi: eq τ rela 9 Dephasing ime of undriven qubi: abi oscillaions of upper level populaion. ns D-Wave D-Wave sems Inc. HE QUANUM COMPUING COMPANY M F eq τ ns ϕ π 6.6GH >> MH π I. Chiorescu e al. cience ;
11 D-Wave D-Wave sems Inc. HE QUANUM COMPUING COMPANY M Deca rae of abi oscillaions: 9 s 5 3 elaaion rae of undriven qubi: eq 9 s 9 Dephasing ime of undriven qubi: eq s 9 eq τ c Frequenc dispersion of he hea bah specrum τ c / π MH For he fla specrum i should be: fla 39.5ns / 3.8 Difference beween and fla poins o he decoherence suppression in 3.8 imes b eernal driving field
12 D-Wave D-Wave sems Inc. HE QUANUM COMPUING COMPANY M Much higher suppression of decoherence b he high-frequenc field - pin / irradiaed b circularl polaried ligh roaing magneic field: r r H elaaion rae a cos sin Q H B << 4χ" coh 4 " coh << 4 χ eq χ" A s e / c s A.Yu. mirnov Phs.ev.B
13 D-Wave D-Wave sems Inc. abi specroscop and noise manipulaion in a flu qubi coupled o a ank circui HE QUANUM COMPUING COMPANY M Qubi: Γ ank as a low-frequenc linear deecor of curren flucuaions in he qubi d d γ d d V >> ank: λ & γ L C E. Il ichev e al. Phs. ev. Le
14 D-Wave D-Wave sems Inc. HE QUANUM COMPUING COMPANY M pecrum of volage flucuaions in he ank heor VQ k Peak value of he specrum a L q C I q Γ V ma γ ~ Γ Γ >> >> γ Direc deecion of radiaion a abi frequenc : F. γ << Γ A.Yu. mirnov Phs.ev.B
15 D-Wave D-Wave sems Inc. HE QUANUM COMPUING COMPANY M pecrum of volage flucuaions in he ank eperimen Τ /π 6.84 MH Q Τ /γ Τ 85 L q 4 ph I q 5 na k -3 mk Decoherence imes:.5µs Jena/D-Wave.5µs Delf pecrum / VQ Peak value of he specrum as a funcion of HF ampliude F a differen HF power heor V ma / P / P P / P /
16 D-Wave sems Inc. D-Wave sems Inc. HE QUANUM COMPUING COMPANY M abi specroscop as a weak coninuous measuremen Measuremen-induced decoherence backacion of he ank on he qubi: << Γ < Γ Γ << γ 4 q q I L k γ γ Γ Γ ignal-o-noise raio: Γ Γ q q V VQ I L k γ abi specroscop is a weak quanum measuremen if: V C γ γ Inernal noise of he ank circui:
17 D-Wave D-Wave sems Inc. HE QUANUM COMPUING COMPANY M Conclusions. ecen measuremens of abi oscillaions in superconducing flu qubis have demonsraed a possibili o suppress decoherence and conrol a noise level in he flu qubis b appling a srong driving field.
Non-Markovian dynamics of an open quantum system in fermionic environments
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