31 research outputs found
Mid-circuit qubit measurement and rearrangement in a Yb atomic array
Measurement-based quantum error correction relies on the ability to determine
the state of a subset of qubits (ancillae) within a processor without revealing
or disturbing the state of the remaining qubits. Among neutral-atom based
platforms, a scalable, high-fidelity approach to mid-circuit measurement that
retains the ancilla qubits in a state suitable for future operations has not
yet been demonstrated. In this work, we perform imaging using a
narrow-linewidth transition in an array of tweezer-confined Yb atoms to
demonstrate nondestructive state-selective and site-selective detection. By
applying site-specific light shifts, selected atoms within the array can be
hidden from imaging light, which allows a subset of qubits to be measured while
causing only percent-level errors on the remaining qubits. As a
proof-of-principle demonstration of conditional operations based on the results
of the mid-circuit measurements, and of our ability to reuse ancilla qubits, we
perform conditional refilling of ancilla sites to correct for occasional atom
loss, while maintaining the coherence of data qubits. Looking towards true
continuous operation, we demonstrate loading of a magneto-optical trap with a
minimal degree of qubit decoherence.Comment: 9 pages, 6 figure
Colonic metastasis from bronchogenic carcinoma presenting as pancolitis
The colonic metastases from bronchogenic carcinoma are rare. We present
a 73 years old man presented with features suggestive of pan colitis
after metastasis from undifferentiated large cell carcinoma of the
lung. The plain radiograph and computed tomography scan of the chest
had revealed a mass lesion in the right lower lobe of lung. He had no
evidence of significant lesions elsewhere. Considering the advanced
stage and poor differentiation of the tumour, no active therapy was
undertaken and he survived for three months. (J Postgrad Med
2002;48:199-200
Left hepatic trisectionectomy for hepatobiliary malignancy: results and an appraisal of its current role
OBJECTIVE: To analyze results of 70 patients undergoing left hepatic trisectionectomy and to clarify its current role.SUMMARY BACKGROUND DATA: Left hepatic trisectionectomy remains a complicated hepatectomy, and few reports have described the long-term results of the procedure.METHODS: Short-term and long-term outcomes of 70 consecutive patients who underwent left hepatic trisectionectomy from January 1993 to February 2004 were analyzed.RESULTS: Of the 70 patients, 36 had colorectal liver metastasis, 24 had cholangiocarcinoma, 4 had hepatocellular carcinoma, and the remaining 6 had other tumors. Overall morbidity, 30-day and 90-day mortality rates were 46%, 7%, and 9%, respectively. Multivariate analysis disclosed that preoperative jaundice and intraoperative blood transfusion were positive independent predictors for postoperative morbidity; however, there were no independent predictors for postoperative mortality. Postoperative morbidity (87% versus 35%, P < 0.001) and mortality (20% versus 5%, P = 0.108) were observed more frequently in patients with preoperative obstructive jaundice than in those without jaundice. Each survival according to tumor type was acceptable compared with reported survivals. Survival for patients with colorectal liver metastasis undergoing left hepatic trisectionectomy with concomitant partial resection of the remnant liver was similar to those without this concomitant procedure. This concomitant procedure was not associated with postoperative morbidity and mortality.CONCLUSIONS: Left hepatic trisectionectomy remains a challenging procedure. Preoperative obstructive jaundice considerably increases perioperative risk. Concomitant partial resection of the remaining liver appears to be safe and offers the potential for cure in patients with colorectal metastasis affecting all liver segments.</p