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d-
.. 1,2, .. 1, .. 1, .. 1, .. 1, .. 1, .. 3, ..
1 3

. .. , 11,

7,
2 3

. .. , 59, . ..

,

1. , ( , -), . [1-3] (), () , s- , d- [1-3]. c s/s , - d- , . d- "" ,

, () s/d- . [4,5] [6-8] , - d/d- , d- [4,5]. s/d . s/d , ,

T*


, s/d , .

2. Nb/Au/M/YBa2Cu3O7- 1010 5050 2. s- , Nb Tc'=9 Au. (Nb) (Au) Au Tc''=8-8.5 Au. YBa2Cu3O7- (YBCO), d- Tc=88-89K. (M) ( 20-50 ) Ca1-xSrxCuO2 (CSCO) x=0.15 0.5, [9]. CSCO/YBCO (NdGaO3). (110)NdGaO3, CSCO/YBCO c - (s/dc ­). (110)NdGaO3 , (110)YBCO ­ s/d45 [10].

(V) . s/45

(V) V3 . , ,
(V), s-. .1 (V) T=4.2K . , [16-18], s/d - ().

3. a


, EJ [11]:
cl

p E exp 0 2 k BT

,

(1)

p ­ , E0 ­ , . , , , :
q En 16 En E0 En d exp 2 2C aE0 e 2C E0 En .

(2)

a d « » , , , E
n

­ ,

. T* , , .

eE0 E0 C k BT *

,

E0=0Ic/2h. ,
C











:

T * (e / k ) h I


(4eC ) .
,



[12]. "" , , () d , () [4].

s-

, . , , V Iq :
p




I qp (V )

2e





k

T
y

2



N
L

E , N R E eV , f E f E eV dE .

(3)

f(E) ­ -, NL,R ­ , T- , - a d-a [13]. s :

E N s E Re 2 E s ­ s -

, (4) 2 s . d-

d()=0cos(2). , s/d45 :

E 2 d N d E, Re E

2

d E



(5)

,

(3) , « »

C 5


e2 s

RQ ~ R , N

(6)

~ 0 s . s/d45,

(110) d-: RN=60 , s/e=1.5

RQ=h/4e2=6.5,

0/e=20, C = 0.72 .
N274: =0.06 , T*=0.4. s/d d/d [14]. s/dc , [4], () C=0.01 , s/d0 4 . s/dc C=0.65 T*1.7. , 1. , T* s/d45 , , s/dc , [4].


4. , d- , s/dc s/d45 , (001) (110) d [3, 10, 15]. [15-17] (Ic1) (Ic2) ( ): Is()=Ic1sin+Ic2sin2+... (7)

qIc2/Ic1. q < -0.5, 0 0<0 c1 I

Ic1II, ,

(7). :
2E J ( , ) q II qI I cI1 cos( ) cos( 2 ) I cII cos( ) cos( 2 ) 1 0 2 2 2 2

(8)

=I-II=e=2e/0 - , , =(I+II)/2 [21]. .2 qI=qII=q= -0.8. , , ( ) , . , , 3050%, . . 2 q , q =-0.5. 0-.

6.














s/d





, ,

( a fe) [10]. Vn=nhfe/2e ( n=1,2..) V1/2+n=(n-1/2)hfe/2e. , a : fe>2eIcRN/h. q . , , (), :

I1 / I c1 (0) 2 max J1 (a) sin( ) qJ 2 (2a) sin( 2) ,


(9)

J1 J2 ­ , . q J1(a0)=0, a0=3.83, I1(0)=qIc(0)J2(2a0) J2(2a0)=0.2. , Ic(0) Ic1. q I1/2. q 1. q =0.4 s/dc N273. q . V / V0 ( V ­ ) V1 1 , V1/2 (. .3). 1/2 1 q (1) [10]:
q 1 2 Rd 11 / 2 Rd 1 / 21

(10)


R

d1

R

d1/2

- V=V1 V=V1

/2

. q . , T=4.2

q

, s/d (. .2). , s/d [10], d/d [6,20] q , . , , T=4.2K. s/dc- - s- q s/d4
5

sd d- . [19] d>>sd, s :
I1RNsds/(eD*), IcRNTse , : d()=0cos(2)+sd D*=0[2ln(3.560/kTc')]-1. (11), (12) , |q|TD*/
sd

(11) (12)

d- s- d-

s/dc |q|·10
-3









T10-4.





|q|0.1 s/dc [19], , , d-, , [19]. |q|0.1

0=0, . 0-. s/d45 (11) (12) , |q|03T/(sdskT)0.8 (110) d- [14-19]. |q|1, 0/2 [15-18, 20]. , s/dc ­ 0, s/d45 ­ 0-. , d- s/d45 ­ c d0/d45, , [20].


7. T* . s/d45 T* , s/dc. =4.2 |q|, , s/d . |q| . |q| s/d45 , s/dc, T* - . , -5408.2008.2, -08-02-00487, NMP3-CT2006-033191 3743.


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1
N 269 271 273* 274 0 0 11 11 x ds 0.15 50 0.15 20 0.5 20 0.5 50 L, 10 10 10 10 Ic, 44 49 334 2.5 RN, 3.0 1.9 0.71 60 C, 0.65 1.9 2 0.78 q -0. -0. -0. -0. 2 08 4 13 EQx106 123 42 40 1340 E0, 90 101 684 5.1 T*, 1.7 1.0 2.7 0.4

- (110)NGO, x ­ CSCO , L , EQ=e2/2C ­ * 273 , ,


. 1. s/d45 274 s/dc 269. .2. E0 |q|. q=0.5. |q|>0.5. . |q|=0.8. s- . .3. 273 ­ 119.5 ­ . V1=246 , ­ V1/2=123 . ­ ­ .


. 1.


.2


.3


Hybrid Josephson junctions with d-wave symmetry of order parameter for ele ments of quantum computing systems

Y.V. Kislinskii, G.A. Ovsyannikov, K.Y. Constant inian, A.V. Shadrin, I.V. Borisenko, P.V. Ko missinskiy, N.V. Klenov, V. K. Kornev.

We present results of an analysis o f hybrid s/d-junctions based on d-wave metal oxide and the swave superconductors for applications in quantum co mput ing as quiet qubits. Parameters of mult ila yer Josephson s/d heterostructures are discussed for their transit ion temperature T* fro m thermal fluctuations to t he macroscopic quantum tunneling process when a double-well potentia l could be experimentally realized in the dc superconducting quantum interfero meter device. Experimental samples made fro m epitaxial thin films of YBa2Cu3O7- (d-wave superconductor),
antiferroma gnetic interlayer Ca1-xSrxCuO2 and Au/Nb bila yer s-wave superconductor wer e deposited on NdGaO3 substrates. The I-V characteristics o f hybrid Josephson junct ions and the fr equency selective detector response functions have been r egister ed in mm wa ve frequency band in or der to evaluate the amplitude and the sign of the 2-nd harmonic of superconducting current-phase relation. The estimated values of T* extrapolated from experimental r esults of dc measurements obtained at temperature T =4.2 K are discussed taking into account results of t heoretical analys is.

Hybrid Josephson junct ion, Macroscopic quantum tunneling, Current-phase relat ion, Doublewell pot ential, Quiet qubit.