SG11201810221YA - Fidelity estimation for quantum computing systems - Google Patents

Abstract

INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 23 November 2017 (23.11.2017) WIPO I PCT IiiimmoimitiaolommiolonsiolimomovoimIE (10) International Publication Number WO 2017/200536 Al (51) International Patent Classification: GOON 99/00 (2010.01) (21) International Application Number: PCT/US2016/032917 (22) International Filing Date: 17 May 2016 (17.05.2016) (25) Filing Language: English (26) Publication Language: English (71) Applicant: GOOGLE INC. [US/US]; 1600 Amphitheatre Parkway, Mountain View, California 94043 (US). (72) Inventors; and (71) Applicants: MARTINIS, John [US/US]; 1600 Amphithe- atre Parkway, Mountain View, California 94043 (US). DING, Nan [CN/US]; 1600 Amphitheatre Parkway, Moun- tain View, California 94043 (US). BABBUSH, Ryan [US/US]; 1600 Amphitheatre Parkway, Mountain View, California 94043 (US). ISAKOV, Sergei V. [RU/CH]; Brandschenkestrasse 110, 8002 Zurich (CH). NEVEN, Hartmut [DE/US]; 1600 Amphitheatre Parkway, Moun- tain View, California 94043 (US). SMELYANSKIY, Vadim [US/US]; 1600 Amphitheatre Parkway, Mountain View, California 94043 (US). CASTRILLO, Sergio Boixo [ES/US]; 1600 Amphitheatre Parkway, Mountain View, California 94043 (US). (74) Agent: FRANZ, Paul E.; Fish & Richardson P.C., P.O. Box 1022, Minneapolis, Minnesota 55440-1022 (US). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, = (54) Title: FIDELITY ESTIMATION FOR QUANTUM COMPUTING SYSTEMS 100 106 710 5118 Qubits Quantum gates Measurement devices 122 _5 - Th 112 116 114 \._.),,. .... I IN ladlij l aed. lis ---* •• 11 11- 7 11 •1 1—.1--- I . 911 11 91W H Fidelity estimation system 104 Quantum IN 1-11-4HI-IHE ,11 • • • • • 108 hardware 102 120 124 kp) W O 20 17 / 2005 36 Al FIG. IA (57) : Methods and apparatus for estimating the fidelity of quantum hardware. In one aspect, a method includes accessing a set of quantum gates; sampling a subset of quantum gates from the set of quantum gates, wherein the subset of quantum gates defines a quantum circuit; applying the quantum circuit to a quantum system and performing measurements on the quantum system to determine output information of the quantum system; calculating output information of the quantum system based on application of the quantum circuit to the quantum system; and estimating a fidelity of the quantum circuit based on the determined output information and the calculated output information of the quantum system. [Continued on next page] WO 2017/200536 Al MIDEDIMOMOIDEIROIDEM0010101111011001110INVOIMIE SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: — with international search report (Art. 21(3))