Fast Accurate State Measurement with Superconducting Qubits
نویسندگان
چکیده
منابع مشابه
Fast accurate state measurement with superconducting qubits.
Faster and more accurate state measurement is required for progress in superconducting qubit experiments with greater numbers of qubits and advanced techniques such as feedback. We have designed a multiplexed measurement system with a bandpass filter that allows fast measurement without increasing environmental damping of the qubits. We use this to demonstrate simultaneous measurement of four q...
متن کاملSupplementary information for Fast Accurate State Measurement with Superconducting Qubits
where CF and VF are the filter capacitance and voltage amplitude. See Fig. 1(a). To compute the ratio Vq/VF we use voltage division. We make the crucial observation that to calculate the qubit damping we must analyze the circuit impedances at the qubit frequency. Because the qubit is off resonance from the measurement resonator, the measurement resonator’s impedance Zr is lower than the impedan...
متن کاملFast tunable coupler for superconducting qubits.
A major challenge in the field of quantum computing is the construction of scalable qubit coupling architectures. Here, we demonstrate a novel tunable coupling circuit that allows superconducting qubits to be coupled over long distances. We show that the interqubit coupling strength can be arbitrarily tuned over nanosecond time scales within a sequence that mimics actual use in an algorithm. Th...
متن کاملQuantum acoustics with superconducting qubits.
Mechanical objects have important practical applications in the fields of quantum information and metrology as quantum memories or transducers for measuring and connecting different types of quantum systems. The field of electromechanics is in pursuit of a robust and highly coherent device that couples motion to nonlinear quantum objects such as superconducting qubits. Here, we experimentally d...
متن کاملDirect measurement of the entanglement of two superconducting qubits via state tomography
The laws of quantum physics provide intriguing possibilities for a tremendous increase in speed compared to classical computation. Because this power is achieved through the controlled evolution of entangled quantum states, a clear demonstration of entanglement represents a key milestone towards the construction of a scalable quantum computer. Although entanglement can be inferred from simple e...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2014
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.112.190504