1 d hysics,U。OF THE B ASQUE C OUNTRY UPV/EHU AND IKERBASQUE, B ILBAO AND DIPC, S AN S EBASTI ´ AN , S PAIN 2 W IGNER R ESEARCH C ENTRE FOR P HYSICS , H UNGARIAN A CADEMY OF S CIENCES , B UDAPEST , H UNGARY 3 I NSTITUTE FOR N UCLEAR R ESEARCH , H UNGARIAN A CADEMY OF S CIENCES , D EBRECEN , H UNGARY 4 I NTERNATIONAL C ENTRE FOR T HEORY OF Q UANTUM T ECHNOLOGIES , U NIVERSITY OF G DA ´ NSK , G DA ´ NSK , P OLAND 5 F ACULTY OF A PPLIED P HYSICS AND M ATHEMATICS , N ATIONAL Q UANTUM I NFORMATION C ENTRE , G DA ´ NSK U NIVERSITY OF T ECHNOLOGY , G DA ´ NSK ,p oland 6 i。t h。p hys。和strophysics,n national q uantum i nformation c enfreation c enfres c,f hysematics,p hysics and i nformatics of niv。g da´nsk