We demonstrate a hardware vulnerability in quantum computing systems by exploiting cross-talk effects on an available commercial quantum computer (IBM). Specifically, based on the cross-talk produced by certain quantum gates, we implement a row hammer attack that ultimately allows us to flip a qubit. Both single-qubit and two-qubit operations are performed and analyzed. Our findings reveal that two-qubit operations applied near the target qubit significantly influence it through cross-talk, effectively compromising its state.We demonstrate a hardware vulnerability in quantum computing systems by exploiting cross-talk effects on an available commercial quantum computer (IBM). Specifically, based on the cross-talk produced by certain quantum gates, we implement a row hammer attack that ultimately allows us to flip a qubit. Both single-qubit and two-qubit operations are performed and analyzed. Our findings reveal that two-qubit operations applied near the target qubit significantly influence it through cross-talk, effectively compromising its state.

arXiv:2503.21650Mar 27, 20250 citations

Communicating with qubit pairs

Almut Beige, Berthold‐Georg Englert, Christian Kurtsiefer +1 more

Computational matematics series/Computational mathematics seriesFeb 14, 20021 citation

A quantum byte with 10 5 cross-talk for fault-tolerant quantum computing

Ch. Piltz, Ch. Wunderlich

The addressing of a particular qubit within a quantum register is a key prerequisite for scalable quantum computing. We demonstrate addressing of individual qubits within a quantum byte (eight qubits) and measure the error induced in non-addressed qubits (cross-talk) associated with the application of single-qubit gates. This cross-talk is on the order of $10^{-5}$ breaching the threshold for fault-tolerant quantum computing. The quantum byte is implemented using $^{171}$ Yb $^+$ ions confined in a Paul trap where a static magnetic gradient field is applied that lifts the hyperfine qubits' degeneracy. Hyperfine qubits are individually addressed using microwave radiation. In addition, we demonstrate a method for addressing individual qubits where an appropriate choice of addressing frequency and microwave pulse duration allows for further lowering cross-talk.The addressing of a particular qubit within a quantum register is a key prerequisite for scalable quantum computing. We demonstrate addressing of individual qubits within a quantum byte (eight qubits) and measure the error induced in non-addressed qubits (cross-talk) associated with the application of single-qubit gates. This cross-talk is on the order of $10^{-5}$ breaching the threshold for fault-tolerant quantum computing. The quantum byte is implemented using $^{171}$Yb$^+$ ions confined in a Paul trap where a static magnetic gradient field is applied that lifts the hyperfine qubits' degeneracy. Hyperfine qubits are individually addressed using microwave radiation. In addition, we demonstrate a method for addressing individual qubits where an appropriate choice of addressing frequency and microwave pulse duration allows for further lowering cross-talk.

Mar 31, 20140 citations

Cross-talk compensation of hyperfine control in donor-qubit architectures

G Kandasamy, Cameron J. Wellard, Lloyd C. L. Hollenberg

We theoretically investigate cross-talk in hyperfine gate control of donor-qubit quantum computer architectures, in particular the Kane proposal. By solving the Poisson and Schrödinger equations numerically for the gated donor system, we calculate the change in hyperfine coupling and thus the error in spin-rotation for the donor nuclear-electron spin system, as the gate-donor distance is varied. We thus determine the effect of cross-talk-the inadvertent effect on non-target neighbouring qubits-which occurs due to closeness of the control gates (20-30 nm). The use of compensation protocols is investigated, whereby the extent of cross-talk is limited by the application of compensation bias to a series of gates. In the light of these factors, architectural implications are then considered.We theoretically investigate cross-talk in hyperfine gate control of donor-qubit quantum computer architectures, in particular the Kane proposal. By solving the Poisson and Schrödinger equations numerically for the gated donor system, we calculate the change in hyperfine coupling and thus the error in spin-rotation for the donor nuclear-electron spin system, as the gate-donor distance is varied. We thus determine the effect of cross-talk-the inadvertent effect on non-target neighbouring qubits-which occurs due to closeness of the control gates (20-30 nm). The use of compensation protocols is investigated, whereby the extent of cross-talk is limited by the application of compensation bias to a series of gates. In the light of these factors, architectural implications are then considered.

arXiv:cond-mat/0605081NanotechnologyAug 22, 200610 citations

10^{-5}

breaching the threshold for fault-tolerant quantum computing. The quantum byte is implemented using

^{171}

^+

ions confined in a Paul trap where a static magnetic gradient field is applied that lifts the hyperfine qubits' degeneracy. Hyperfine qubits are individually addressed using microwave radiation. In addition, we demonstrate a method for addressing individual qubits where an appropriate choice of addressing frequency and microwave pulse duration allows for further lowering cross-talk.